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  • 1.
    Ali, Imran
    et al.
    Stockholms universitet.
    Kremer, Reinhard K.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Johnsson, Mats
    Synthesis and Magnetic Properties of the Ternary OxofluorideFe3Sb4O6F62020Ingår i: European Journal of Inorganic Chemistry, ISSN 1434-1948, E-ISSN 1099-1948, s. 3746-3752Artikel i tidskrift (Refereegranskat)
  • 2.
    Allard, Bert
    et al.
    Man-Technology-Environment Research Centre (MTM), Örebro University, SE-701 82 Örebro, Sweden.
    Sjöberg, Susanne
    Department of Geological Sciences, Stockholm University, SE-106 91 Stockholm, Sweden.
    Sjöberg, Viktor
    Man-Technology-Environment Research Centre (MTM), Örebro University, SE-701 82 Örebro, Sweden.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap. Department of Geosciences, Swedish Museum of Natural History, SE-114 18 Stockholm, Sweden.
    Karlsson, Stefan
    Man-Technology-Environment Research Centre (MTM), Örebro University, SE-701 82 Örebro, Sweden.
    Metal Exchangeability in the REE-Enriched Biogenic Mn Oxide Birnessite from Ytterby, Sweden2023Ingår i: Minerals, E-ISSN 2075-163X, Vol. 13, s. 1-14, artikel-id 1023Artikel i tidskrift (Refereegranskat)
  • 3.
    Altieri, Alessandra
    et al.
    Sapienza University, Rome, Italy.
    Luppi, Riccardo
    Sapienza University, Rome, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Tempesta, Gioacchino
    Università degli Studi di Bari Aldo Moro, Bari, Italy.
    Pezzotta, Federico
    MUM–Mineralogical Museum “Luigi Celleri”,Campo nell’Elba, Leghorn, Italy.
    Bosi, Ferdinando
    Sapienza University, Rome, Italy.
    Thermal treatment of the tourmaline Fe-rich princivalleite Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O2023Ingår i: Physics and chemistry of minerals, ISSN 0342-1791, E-ISSN 1432-2021, Vol. 50, nr 4, s. 1-12, artikel-id 27Artikel i tidskrift (Refereegranskat)
    Ladda ner fulltext (pdf)
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  • 4. Altieri, Alessandra
    et al.
    Pezzotta, Federico
    Andreozzi, Giovanni B.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Bosi, Ferdinando
    Genetic model for the color anomalies at the termination of pegmatitic gem tourmaline crystals from the island of Elba, Italy2023Ingår i: European journal of mineralogy, ISSN 0935-1221, E-ISSN 1617-4011, Vol. 35, nr 5, s. 755-771Artikel i tidskrift (Refereegranskat)
  • 5. Altieri, Alessandra
    et al.
    Pezzotta, Federico
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Bosi, Ferdinando
    Blue growth zones caused by Fe2+ in tourmaline crystals from the San Piero in Campo gem-bearing pegmatites, Elba Island, Italy2022Ingår i: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 86, nr 6, s. 910-919Artikel i tidskrift (Refereegranskat)
  • 6. Altieri, Alessandra
    et al.
    Pezzotta, Federico
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Bosi, Ferdinando
    Dark-coloured Mn-rich overgrowths in an elbaitic tourmaline crystal from the Rosina pegmatite, San Piero in Campo, Elba Island, Italy: witness of late-stage opening of the geochemical system2023Ingår i: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 87, nr 1, s. 130-142Artikel i tidskrift (Refereegranskat)
    Ladda ner fulltext (pdf)
    fulltext
  • 7.
    Andreozzi, Giovanni
    et al.
    Sapienza Università di Roma, Italy.
    D'Ippolito, Veronica
    Sapienza Università di Roma, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Bosi, Ferdinando
    Sapienza Università di Roma, Italy.
    Color mechanisms in spinel: a multi-analytical investigation of natural crystals with a wide range of coloration.2019Ingår i: Physics and chemistry of minerals, ISSN 0342-1791, E-ISSN 1432-2021, Vol. 46, nr 4, s. 343-360Artikel i tidskrift (Refereegranskat)
  • 8. Ballirano, Paolo
    et al.
    Celata, Beatrice
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Andreozzi, Giovanni
    Bosi, Ferdinando
    HT breakdown of Mn-bearing elbaite from the Anjanabonoina pegmatite, Madagascar2022Ingår i: Journal of Geosciences, ISSN 1802-6222, E-ISSN 1803-1943, Vol. 67, s. 151-161Artikel i tidskrift (Refereegranskat)
  • 9. Ballirano, Paolo
    et al.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Gianchiglia, Flaminia
    Di Carlo, Maria Cristina
    Campopiano, Antonella
    Cannizzaro, Annapaola
    Olori, Angelo
    Pacella, Alessandro
    Chemical and structural characterization of UICC amosite fibres from Penge mine (South Africa)2022Ingår i: Periodico di Mineralogia, ISSN 0369-8963, E-ISSN 2239-1002, Vol. 91, s. 143-154Artikel i tidskrift (Refereegranskat)
  • 10. Bernardi, Francesco
    et al.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Lenaz, Davide
    University of Trieste.
    OH-Defects in Detrital Quartz Grains from the Julian Basin (NE Italy and Slovenia): A Fourier Transform Infrared Study2022Ingår i: Geosciences, E-ISSN 2076-3263, Vol. 12, artikel-id 90Artikel i tidskrift (Refereegranskat)
  • 11.
    Biagioni, Cristian
    University of Pisa.
    Pasero, Marco
    University of Pisa.
    Bonaccorsi, Elena
    Lepore, Giovanni Orazio
    Zaccarini, Federica
    University of Leoben.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Crystal-chemistry of sulfates from the Apuan Alps (Tuscany, Italy). VI. Tl-bearingalum-(K) and voltaite from the Fornovolasco mining complex2020Ingår i: American Mineralogist, ISSN 0003-004X, E-ISSN 1945-3027, Vol. 105, s. 1088-1098Artikel i tidskrift (Refereegranskat)
  • 12. Biagioni, Cristian
    et al.
    Bosi, Ferdinando
    Mauro, Daniela
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Dini, Andrea
    Zaccarini, Federica
    Dutrowite, Na(Fe2+2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3O, a new mineral from the Apuan Alps (Tuscany, Italy): the first member of the tourmaline supergroup with Ti as a species-forming chemical constituent2023Ingår i: European journal of mineralogy, ISSN 0935-1221, E-ISSN 1617-4011, Vol. 35, nr 1, s. 81-94Artikel i tidskrift (Refereegranskat)
  • 13.
    Bosi, Ferdinando
    University of Rome "La Sapienza".
    Lucchesiite, CaFe2+3 Al6(Si6O18)(BO3)3(OH)3O, a new mineralspecies of the tourmaline supergroup2017Ingår i: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 81, nr 1, s. 1-14Artikel i tidskrift (Refereegranskat)
  • 14.
    Bosi, Ferdinando
    University of Rome "La Sapienza".
    Balik-Zunic, Tonci
    Natural History Museum of Denmark.
    Thermal stability of extended clusters in dravite: a combined EMP, SREF and FTIR study.2016Ingår i: Physics and chemistry of minerals, ISSN 0342-1791, E-ISSN 1432-2021, Vol. 43, s. 395-407Artikel i tidskrift (Refereegranskat)
  • 15.
    Bosi, Ferdinando
    et al.
    Università di Roma, Italien.
    Andreozzi, Giovanni
    Università di Roma, Italien.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Experimental evidence for partial Fe2+ disorder at the Y and Z sites of tourmaline: a combined EMP, SREF, MS, IR and OAS study of schorl2015Ingår i: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 79, nr 3, s. 515-528Artikel i tidskrift (Refereegranskat)
  • 16.
    Bosi, Ferdinando
    et al.
    Sapienza Università di Roma, Italy.
    Biagioni, Cristian
    Università di Pisa, Italy.
    Pezzotta, Federico
    Natural History Museum, Milan, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Cempírek, Jan
    Masaryk University, Brno, Czech Republic.
    Hawthorne, Frank C.
    University of Manitoba, Canada.
    Lussier, Aaron J.
    Univeristy of Manitoba, Canada.
    Abdu, Yassir A.
    University of Manitoba, Canada.
    Day, Maxwell C.
    University of Manitoba, Canada.
    Fayek, Mostafa
    University of Manitoba, Canada.
    Clark, Christine M.
    Eastern Michigan University, USA.
    Grice, Joel D.
    Canadian Museum of Nature, Ottawa, Canada.
    Henry, Darrell J.
    Lousiana State University, USA.
    Uvite, CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH), a new, but long-anticipated mineral species of the tourmaline supergroup from San Piero in Campo, Elba Island, Italy2022Ingår i: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 86, nr 5, s. 767-776Artikel i tidskrift (Refereegranskat)
    Ladda ner fulltext (pdf)
    fulltext
  • 17.
    Bosi, Ferdinando
    et al.
    Sapienza Università di Roma, Italy.
    Celata, Beatrice
    Sapienza Università di Roma, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Tempesta, Gioacchino
    University of Bari "Aldo Moro", Italy.
    Ciriotti, Marco
    University of Turin, Italy.
    Bittarello, Erica
    Univerity of Turin, Italy.
    Marengo, Alessandra
    Univerity of Turin, Italy.
    Mn-bearing purplish-red tourmaline from the Anjanabonoina pegmatite, Madagascar2021Ingår i: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 85, nr 2, s. 242-253Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A gem-quality purplish-red tourmaline sample of alleged liddicoatitic composition from the Anjanabonoina pegmatite, Madagascar, hasbeen fully characterised using a multi-analytical approach to define its crystal-chemical identity. Single-crystal X-ray diffraction, chem-ical and spectroscopic analysis resulted in the formula: X(Na0.410.35Ca0.24)Σ1.00Y(Al1.81Li1.00

    Fe3+0.04Mn3+0.02Mn2+0.12Ti0.004)Σ3.00

    ZAl6[T(Si5.60B0.406.00O18]

    (BO3)3(OH)3W[(OH)0.50F0.13O0.37]Σ1.00, which corresponds to the tourmaline species elbaite having the typical space group R3m and relatively small unit-cell dimensions, a= 15.7935(4) Å, c= 7.0860(2) Å and V= 7.0860(2) Å3.Optical absorption spectroscopy showed that the purplish-red colour is caused by minor amounts of Mn3+(Mn2O3= 0.20 wt.%).Thermal treatment in air up to 750°C strongly intensified the colour of the sample due to the oxidation of all Mn2+ to Mn3+ (Mn2O3 up to 1.21 wt.%). Based on infrared and Raman data, a crystal-chemical model regarding the electrostatic interaction betweenthe X cation and W anion, and involving the Y cations as well, is proposed to explain the absence or rarity of the mineral species ‘liddicoatite’.

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  • 18.
    Bosi, Ferdinando
    et al.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Henrik, Skogby
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Oxy-dravite, Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup2013Ingår i: American Mineralogist, ISSN 0003-004X, E-ISSN 1945-3027, Vol. 98, s. 1442-1448Artikel i tidskrift (Refereegranskat)
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    BosiPreprintAugSept_13
  • 19.
    Bosi, Ferdinando
    et al.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Andreozzi, Giovanni B.
    Sapienza Università di Roma.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Lucchesi, Sergio
    Sapienza Università di Roma.
    Structural refinement of Mn-doped spinel: a case for tetrahedrally coordinated Mn3+ in an oxygen-based structure2007Ingår i: American Mineralogist, ISSN 0003-004X, E-ISSN 1945-3027, Vol. 92, s. 27-33Artikel i tidskrift (Refereegranskat)
  • 20.
    Bosi, Ferdinando
    et al.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Crystal chemistry of the magnetite-ulvöspinel series2009Ingår i: American Mineralogist, ISSN 0003-004X, E-ISSN 1945-3027, Vol. 94, s. 181-189Artikel i tidskrift (Refereegranskat)
  • 21.
    Bosi, Ferdinando
    et al.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Crystal chemistry of the MgAl2O4-MgMn2O4-MnMn2O4 system: Analysis of structural distortion in spinel and hausmannite-type structures2010Ingår i: American Mineralogist, ISSN 0003-004X, E-ISSN 1945-3027, Vol. 95, s. 602-607Artikel i tidskrift (Refereegranskat)
  • 22.
    Bosi, Ferdinando
    et al.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Crystal chemistry of the ulvöspinel-qandilite series2014Ingår i: American Mineralogist, ISSN 0003-004X, E-ISSN 1945-3027, Vol. 99, s. 847-851Artikel i tidskrift (Refereegranskat)
  • 23.
    Bosi, Ferdinando
    et al.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Stoichiometry of synthetic ulvöspinel single crystals2008Ingår i: American Mineralogist, ISSN 0003-004X, E-ISSN 1945-3027, Vol. 93, s. 1312-1316Artikel i tidskrift (Refereegranskat)
  • 24.
    Bosi, Ferdinando
    et al.
    Sapienza Università di Roma, Italy.
    Naitza, Stefano
    Università degli Studi di Cagliari, Italy.
    Secchi, Francesco
    Università degli Studi di Sassari, Italy.
    Conte, Aida M.
    CNR, Sede Secondaria di Roma "Sapienza", Roma, Italy.
    Cuccuru, Stefano
    Università degli Studi di Sassari, Italy.
    Andreozzi, Giovanni B.
    Sapienza Università di Roma, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Petrogenic controls on the origin of tourmalinite veins from Mandrolisai igneous massif (central Sardinia, Italy): Insights from tourmaline crystal chemistry2019Ingår i: Lithos, ISSN 0024-4937, E-ISSN 1872-6143, Vol. 342-343, s. 333-344Artikel i tidskrift (Refereegranskat)
  • 25.
    Bosi, Ferdinando
    et al.
    Sapienza Università di Roma, Italy.
    Naitza, Stefano
    Università degli Studi di Cagliari, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Secchi, Francesco
    Università degli Studi di Sassari, Italy.
    Conte, Aida M.
    CNR-Istituto di Georiscienze e Georisose, Rome, Italy.
    Cuccuru, Stafano
    Università degli Studi di Sassari.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    De La Rosa, Nathaly
    Division of Nuclear Physics, Lund University.
    Kristiansson, Per
    Division of Nuclear Physics, Lund University.
    Nilsson, E.J. Charlotta
    Division of Nuclear Physics, Lund University.
    Ros, Linus
    Division of Nuclear Physics, Lund University.
    Andreozzi, Giovanni B.
    Sapienza Università di Roma, Italy.
    Late magmatic controls on the origin of schorlitic and foititic tourmalines from late-Variscan peraluminous granites of the Arbus pluton (SW Sardinia, Italy): Crystal-chemical study and petrological constraints2018Ingår i: Lithos, ISSN 0024-4937, E-ISSN 1872-6143, Vol. 308-309, s. 395-411Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Tourmalines from the late-Variscan Arbus pluton (SWSardinia) and its metamorphic aureole were structurally and chemically characterized by single-crystal X-ray diffraction, electron and nuclear microprobe analysis, Mössbauer, infrared and optical absorption spectroscopy, to elucidate their origin and relationships with the magmatic evolution during the pluton cooling stages. The Arbus pluton represents a peculiar shallow magmatic system, characterized by sekaninaite (Fe-cordierite)-bearing peraluminous granitoids, linked via AFC processes to gabbroic mantle-derived magmas. The Fe2+-Al-dominant tourmalines occur in: a) pegmatitic layers and pods, as prismatic crystals; b) greisenized rocks and spotted granophyric dikes, as clots or nests of fine-grained crystals in small miaroles locally forming orbicules; c) pegmatitic veins and pods close to the contacts within the metamorphic aureole. Structural formulae indicate that tourmaline in pegmatitic layers is schorl, whereas in greisenized rocks it ranges fromschorl to fluor-schorl. Tourmalines in thermometamorphosed contact aureole are schorl, foitite and Mg-rich oxy-schorl. The main substitution is Na+Fe2+↔▢+Al, which relates schorl to foitite. The homovalent substitution (OH)F at the O1 crystallographic site relates schorl to fluor-schorl, while the heterovalent substitution Fe2++(OH, F)Al+O relates schorl/fluor-schorl to oxy-schorl. Tourmaline crystallization in the Arbus pluton was promoted by volatile (B, F and H2O) enrichment, low oxygen fugacity and Fe2+ activity. The mineralogical evolutive trend is driven by decreasing temperature, as follows: sekaninaite+quartz →schorl+quartz→fluor-schorl+quartz → foitite+quartz. The schorl→foitite evolution represents a distinct trend towards (Al+!) increase and unit-cell volumedecrease. These trends are typical of granitic magmas and consistent with Li-poor granitic melts, as supported by the absence of elbaite and other Li-minerals in the Arbus pluton. Tourmaline-bearing rocks reflect the petrogenetic signi!cance of contribution from a metapelitic crustal component during the evolution of magmas in the middle-upper crust.

  • 26.
    Bosi, Ferdinando
    et al.
    Sapienza Università di Roma, Italy.
    Pezzotta, Federico
    Natural History Museum, Milano, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Altieri, Alessandra
    Sapienza Università di Roma, Italy.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Tempesta, Gioacchino
    Univeristy of Bari, Italy.
    Cempírek, Jan
    Masaryk University, Brno, Czech Republic.
    Princivalleite, Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup from Veddasca Valley, Varese, Italy2022Ingår i: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 86, nr 1, s. 78-86Artikel i tidskrift (Refereegranskat)
    Ladda ner fulltext (pdf)
    fulltext
  • 27.
    Bosi, Ferdinando
    et al.
    Sapienza Università di Roma, Italy.
    Reznitskii, Leonid
    Russian Academy of Science, Irkutsk, Russia.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Crystal chemistry of Al-V-Cr oxy-tourmalines from Sludyanka complex, Lake Baikal, Russia2017Ingår i: European journal of mineralogy, ISSN 0935-1221, E-ISSN 1617-4011, Vol. 29, nr 3, s. 457-472Artikel i tidskrift (Refereegranskat)
  • 28.
    Bosi, Ferdinando
    et al.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Reznitskii, Leonid
    Russian Academy of Science.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Vanadio-oxy-chromium-dravite, NaV3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup 2014Ingår i: American Mineralogist, ISSN 0003-004X, E-ISSN 1945-3027, Vol. 99, s. 1155-1162Artikel i tidskrift (Refereegranskat)
  • 29.
    Bosi, Ferdinando
    et al.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Reznitskii, Leonid
    Russian Academy of Science, Irkutsk.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Vanadio-oxy-dravite, NaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup2014Ingår i: American Mineralogist, ISSN 0003-004X, E-ISSN 1945-3027, Vol. 99, s. 218-224Artikel i tidskrift (Refereegranskat)
  • 30.
    Bosi, Ferdinando
    et al.
    Sapienza Università di Roma, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Fregola, Rosa Anna
    Università di Bari Aldo Moro, Italy.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Crystal chemistry of spinels in the system MgAl2O4-MgV2O4-Mg2VO42016Ingår i: American Mineralogist, ISSN 0003-004X, E-ISSN 1945-3027, Vol. 101, s. 580-586Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Eight spinel single-crystal samples belonging to the spinel sensu stricto-magnesiocoulsonite series (MgAl2O4-MgV2O4) were synthesized and crystal-chemically characterized by X‑ray diffraction, electron microprobe and optical absorption spectroscopy. Site populations show that the tetrahedrally coordinated site (T) is populated by Mg and minor Al for the spinel sensu stricto compositions, and only by Mg for the magnesiocoulsonite compositions, while the octahedrally coordinated site (M) is populated by Al, V3+, minor Mg, and very minor amounts of V4+. The latter occurs in appreciable amounts in the Al-free magnesium vanadate spinel, T(Mg)M(Mg0.26V3+1.48V4+0.26)O4, showing the presence of the inverse spinel VMg2O4. The studied samples are characterized by substitution of Al3+ for V3+ and (Mg2++V4+) for 2V3+ described in the system MgAl2O4-MgV2O4-VMg2O4.

    The present data in conjunction with data from the literature provide a basis for quantitative analyses of two solid-solution series MgAl2O4-MgV23+O4 and MgV23+O4-V4+Mg2O4. Unit-cell parameter increases with increasing V3+ along the series MgAl2O4-MgV2O4 (8.085–8.432 Å), but only slightly increases with increasing V3+ along the series VMg2O4-MgV2O4 (8.386–8.432 Å). Although a solid solution could be expected between the MgAl2O4 and VMg2O4 end-members, no evidence was found. Amounts of V4+ are nearly insignificant in all synthetic Al-bearing vanadate spinels, but are appreciable in Al-free vanadate spinel.

    An interesting observation of the present study is that despite the observed complete solid-solution along the MgAl2O4-MgV2O4 and MgV2O4-VMg2O4 series, the spinel structure seems to be unable to stabilize V4+ in any intermediate members on the MgAl2O4-Mg2VO4 join even at high oxygen fugacities. This behavior indicates that the accommodation of specific V-valences can be strongly influenced by crystal-structural constraints, and any evaluation of oxygen fugacities during mineral formation based exclusively on V cation valence distributions in spinel should be treated with caution. The present study underlines that the V valency distribution in spinels is not exclusively reflecting oxygen fugacities, but also depends on activities and solubilities of all chemical components in the crystallization environment.

  • 31. Bosi, Ferdinando
    et al.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hovis, Guy L.
    Crystal chemistry of povondraite by single-crystal XRD, EMPA, Mössbauer spectroscopy and FTIR2023Ingår i: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 87, nr 2, s. 178-185Artikel i tidskrift (Refereegranskat)
  • 32.
    Bosi, Ferdinando
    et al.
    Sapienza Università di Roma, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Oxy-foitite, □(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup2017Ingår i: European journal of mineralogy, ISSN 0935-1221, E-ISSN 1617-4011, Vol. 29, nr 5, s. 889-896Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Oxy-foitite, □(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O, is a new mineral of the tourmaline supergroup. It occurs in high-grade migmatitic gneisses of pelitic composition at the Cooma metamorphic Complex (New South Wales, Australia), in association with muscovite, K-feldspar and quartz. Crystals are black with a vitreous luster, sub-conchoidal fracture and gray streak. Oxy-foitite has a Mohs hardness of ∼7, and has a calculated density of 3.143 g/cm3. In plane-polarized light, oxy-foitite is pleochroic (O= dark brown and E = pale brown), uniaxial negative. Oxy-foitite belongs to the trigonal crystal system, space group R3ma = 15.9387(3) Å, c = 7.1507(1)Å and V = 1573.20(6)Å3,Z = 3. The crystal structure of oxy-foitite was refined to R1 = 1.48% using 3247 unique reflections from single-crystal X-ray diffraction using MoKα radiation. Crystal-chemical analysis resulted in the empirical structural formula: X(□0.53Na0.45Ca0.01K0.01)Σ1.00Y(Al1.53Fe2+1.16Mg0.22Mn2+0.05Zn0.01Ti4+0.03)Σ3.00Z(Al5.47Fe3+0.14Mg0.39)Σ6.00[(Si5.89Al0.11)Σ6.00O18](BO3)3V(OH)3W[O0.57F0.04(OH)0.39]Σ1.00. Oxy-foitite belongs to the X-site vacant group of the tourmaline-supergroup minerals, and shows chemical relationships with foitite through the substitution YAl3++WO2-YFe2++W(OH)1–.

  • 33.
    Bosi, Ferdinando
    et al.
    Sapienza Università di Roma, Rome, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Thermally induced cation redistribution in Fe‑bearing oxy‑dravite and potential geothermometric implications2016Ingår i: Contributions to Mineralogy and Petrology, ISSN 0010-7999, E-ISSN 1432-0967, Vol. 171, nr 5, s. 1-14, artikel-id 47Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Iron-bearing oxy-dravite was thermally treated in air and hydrogen atmosphere at 800 °C to study potential changes in Fe, Mg and Al ordering over the octahedrally coordinated Y and Z sites and to explore possible applications to intersite geothermometry based on tourmaline. Overall, the experimental data (structural refinement, Mössbauer, infrared and optical absorption spectroscopy) show that heating Fe-bearing tourmalines results in disordering of Fe over Y and Z balanced by ordering of Mg at Y, whereas Al does not change appreciably. The Fe disorder depends on temperature, but less on redox conditions. The degree of Fe3+–Fe2+ reduction is limited despite strongly reducing conditions, indicating that the fO2 conditions do not exclusively control the Fe oxidation state at the present experimental conditions. Untreated and treated samples have similar short- and long-range crystal structures, which are explained by stable Al-extended clusters around the O1 and O3 sites. In contrast to the stable Al clusters that preclude any temperature-dependent Mg–Al order– disorder, there occurs Mg diffusion linked to temperaturedependent exchange with Fe. Ferric iron mainly resides around O2− at O1 rather than (OH), but its intersite disorder induced by thermal treatment indicates that Fe redistribution is the driving force for Mg–Fe exchange and that its diffusion rates are significant at these temperatures. With increasing temperature, Fe progressively disorders over Y and Z, whereas Mg orders at Y according to the order–disorder reaction: YFe + ZMg → ZFe + YMg. The presented findings are important for interpretation of the post-crystallization history of both tourmaline and tourmaline host rocks and imply that successful tourmaline geothermometers may be developed by thermal calibration of the Mg– Fe order–disorder reaction, whereas any thermometers based on Mg–Al disorder will be insensitive and involve large uncertainties.

  • 34.
    Bosi, Ferdinando
    et al.
    Sapienza Università di Roma, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Thermally induced cation redistribution in fluor-elbaite and Fe-bearing tourmalines2019Ingår i: Physics and chemistry of minerals, ISSN 0342-1791, E-ISSN 1432-2021, Vol. 46, nr 4, s. 371-383Artikel i tidskrift (Refereegranskat)
  • 35.
    Bosi, Ferdinando
    et al.
    Sapienza Università di Roma, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Ciriotti, Marco
    Associazione Micromineralogica Italiana,Torino, Italy.
    Experimental cation redistribution in the tourmaline lucchesiite, CaFe2+3Al6(Si6O18)(BO3)3(OH)3O2018Ingår i: Physics and chemistry of minerals, ISSN 0342-1791, E-ISSN 1432-2021, Vol. 45, nr 7, s. 621-632Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Natural Mg-rich lucchesiite was thermally treated in air and hydrogen atmosphere up to 800 °C to study potential changes in Fe-, Mg- and Al ordering over the octahedrally coordinated Y-  and Z -sites, and to explore possible applications to intracrystalline geothermometry based on tourmaline. Overall, the experimental data (structural refinement, Mössbauer, infrared and optical absorption spectroscopy) show that thermal treatment of lucchesiite results in an increase of Fetot contents at Z balanced by an increase of Mg and Al at Y . This process is accompanied by a significant deprotonation of the O3 anion site. The Fe order–disorder reaction depends more on temperature, than on redox conditions. During heat treatment in H2 ,reduction of Fe3+ to Fe2+ was not observed despite strongly reducing conditions, indicating that the fO2  conditions do not exclusively control the Fe oxidation state at the present experimental conditions. On the basis of this and previous studies, the intersite order–disorder process induced by thermal treatment indicates that Fe redistribution is an important factor for Fe–Mg–Al-exchange and is significant at temperatures around 800 °C. As a result, Fe–Mg–Al intersite order–disorder is sensitive to temperature variations, whereas geothermometers based solely on Mg–Al order–disorder appear insensitive and involve large uncertainties. The presented findings are important for interpretation of the post-crystallization history of both tourmaline and tourmaline host rocks, and indicate that successful tourmaline geothermometers may be developed by thermal calibration of the Fe-Mg–Al order–disorder reaction.

  • 36. Bosi, Ferdinando
    et al.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Ciriotti, Marco E.
    Università di Torino, Italy.
    Mills, Stuart J.
    Geosciences, Museums Victoria, Melbourne, Australia.
    Lowering R3m Symmetry in Mg-Fe-Tourmalines: The Crystal Structures of Triclinic Schorl and Oxy-Dravite, and the Mineral luinaite-(OH) Discredited2022Ingår i: Minerals, E-ISSN 2075-163X, Vol. 12, nr 4, s. 1-10, artikel-id 430Artikel i tidskrift (Refereegranskat)
    Ladda ner fulltext (pdf)
    fulltext
  • 37.
    Bosi, Ferdinando
    et al.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Reznitskii, Leonid
    Russian Academy of Science, Irkutsk.
    Crystallographic and spectroscopic characterization of Fe-bearing chromo-alumino-povondraite and its relationships with oxy-chromium-dravite and oxy-dravite2013Ingår i: American Mineralogist, ISSN 0003-004X, E-ISSN 1945-3027, Vol. 98, s. 1557-1564Artikel i tidskrift (Refereegranskat)
  • 38.
    Bosi, Ferdinando
    et al.
    Sapienza Universita di Roma.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Lazor, Peter
    Uppsala Universitet.
    Reznitskii, Leonid
    Russian Academy of Sciences.
    Atomic arrangements around the O3 site in Al- and Cr-rich oxytourmalines: a combined EMP, SREF, FTIR and Raman study2015Ingår i: Physics and chemistry of minerals, ISSN 0342-1791, E-ISSN 1432-2021, Vol. 42, s. 441-453Artikel i tidskrift (Refereegranskat)
    Ladda ner fulltext (pdf)
    fulltext
  • 39.
    Bruschini, E.
    et al.
    Institute for Space Astrophysics and Planetology (IAPS) – National Institute for Astrophysics (INAF) Rome Italy.
    Carli, C.
    Institute for Space Astrophysics and Planetology (IAPS) – National Institute for Astrophysics (INAF) Rome Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Andreozzi, G. B.
    Department of Earth Sciences Sapienza University of Rome Rome Italy.
    Stojic, A.
    Institut für Planetologie Münster Germany.
    Morlok, A.
    Institut für Planetologie Münster Germany.
    Spectroscopic Characterization of Impactites and a Machine Learning Approach to Determine the Oxidation State of Iron in Glass‐Bearing Materials2023Ingår i: Journal of Geophysical Research - Planets, ISSN 2169-9097, E-ISSN 2169-9100, Vol. 128, nr 3, artikel-id e2023JE007736Artikel i tidskrift (Refereegranskat)
  • 40. Celata, Beatrice
    et al.
    Stagno, Vincenzo
    Capizzi, Luca S.
    Bosi, Ferdinando
    Ballirano, Paolo
    D'Arco, Annalisa
    Stopponi, Veronica
    Lupi, Stefano
    Scarlato, Piergiorgio
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Andreozzi, Giovanni B.
    Schorl breakdown at upper mantle conditions: Insights from an experimental study at 3.5 GPa2023Ingår i: Lithos, ISSN 0024-4937, E-ISSN 1872-6143, Vol. 438-439, s. 1-11, artikel-id 106999Artikel i tidskrift (Refereegranskat)
  • 41.
    Cámara, Fernando
    et al.
    University of Milan, Italy.
    Bosi, Ferdinando
    Sapienza Università di Roma, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Celata, Beatrice
    Sapienza Università di Roma, Italy.
    Ciriotti, Marco
    Università di Torino, Italy.
    Schorl-1A from Langesundsfjord (Norway)2022Ingår i: Journal of Geosciences, ISSN 1802-6222, E-ISSN 1803-1943, Vol. 67, nr 2, s. 129-139Artikel i tidskrift (Refereegranskat)
    Ladda ner fulltext (pdf)
    fulltext
  • 42.
    Cámara, Fernando
    et al.
    Università degli Studi di Milano,.
    Holtstam, Dan
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Karlsson, Andreas
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Old samples - new amphiboles2022Ingår i: Abstracts, International Mineralogical Association 23rd General meeting, Lyon, 2022, Vol. 1, s. 42-42Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The scientific value of old and well-preserved collections is priceless. Samples that already have been studied and described can still give very useful information. For instance, minerals with complex solid solutions like amphiboles sometimes show new compositions that are feasible because of crystal-chemistry and charge arrangements, based on the current classification scheme by Hawthorne et al. (2012) for the amphibole supergroup. In the last four years, a fruitful collaboration between the Swedish Museum of Natural History and the Department of Earth Sciences of the University of Milan has allowed the identification of new amphibole species, recognized by CNMNC-IMA. First of all, we identified hjalmarite, [ANaB(NaMn)CMg5TSi8O22W(OH)2], which is related to richterite via the homovalent substitution [B]Ca2+ → [B]Mn2+, and is the second recognized member of the sodium–(magnesium–iron–manganese) subgroup, after ferri-ghoseite. Sjögren (1891) had described a physically similar, MnO-rich sample from Långban, named “astochit”. A related amphibole, although belonging to a different subgroup, that we have formally described is potassic-richterite, [AKB(NaCa)CMg5TSi8O22W(OH)2]. It was found in a sample from the Pajsberg iron and manganese ore mines, which was originally collected by the mineralogist Lars Johan Igelström, probably in the 1850s. The most recent amphibole we have described is ferri-taramite [ANaB(NaCa)C(Mg3Fe3+2)T(Si6Al2)O22W(OH)2], found in a skarn sample from the Jakobsberg manganese mine: it was once examined by Flink (1914), who noted the unusual character of the amphibole and described it as a “strange hornblende”.

    Ladda ner fulltext (pdf)
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  • 43.
    De La Rosa, Nathaly
    et al.
    Lunds universitet.
    Kristiansson, Per
    Lunds universitet.
    Nilsson, Charlotta
    Lunds universitet.
    Ros, Linus
    Lunds universitet.
    Pallon, Jan
    Lunds universitet.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Quantification of lithium at ppm level in geological samples using nuclear reaction analysis2018Ingår i: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780, Vol. 317, s. 253-259Artikel i tidskrift (Refereegranskat)
  • 44.
    de Vries, Bernard
    et al.
    Stockholms universitet.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Waters, L.B.F.M.
    University of Amsterdam.
    Min, M
    University of Amsterdam.
    Laboratory mid-IR spectra of equilibrated and igneous meteorites. Searching for observables of planetesimal debris2018Ingår i: Icarus, ISSN 0019-1035, E-ISSN 1090-2643, Vol. 307, s. 400-416Artikel i tidskrift (Refereegranskat)
  • 45.
    D'Ippolito, Veronica
    et al.
    Sapienza University, Rome, Italy.
    Andreozzi, Giovanni
    Sapienza University, Rome, Italy.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hametner, Kathrin
    ETH, Zürich, Switzerland.
    Günther, Detlef
    ETH, Zürich, Swizerland.
    Color mechanisms in spinel: cobalt and iron interplay for the blue color2015Ingår i: Physics and chemistry of minerals, ISSN 0342-1791, E-ISSN 1432-2021, Vol. 42, nr 6, s. 431-439Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Six natural, blue colored spinel crystals were studied chemically by electron microprobe and laser ablation inductively coupled plasma mass spectrometry (LAICP-MS) techniques and optically by UV–VIS–NIR–MIR spectroscopy in the range 30,000–2,000 cm1  to investigate the causes of their blue color hues. The positions of the absorption bands vary only marginally with the principal composition of the samples (gahnite vs. spinel s.s .). Although blue colors in spinels are frequently the result of various electronic processes in Fe cations, we demonstrate by comparison with synthetic Co-bearing samplesthat Co acts as an important chromophore also in natural spinels. Already at concentration levels of a few ppm (e.g.,>10 ppm), cobalt gives rise to absorption bands at ~18,000, 17,000 and 16,000 cm1  that result in distinct blue coloration. In spinels with insignificant Co contents, different shades of paler blue (from purplish to greenish blue) colors are caused by electronic transitions in TFe2+, MFe2+, MFe3and Fe2+–Fe3 cation pairs.

  • 46. Eslami, Alireza
    et al.
    Grieco, Giovanni
    Bussolesi, Micol
    Ichiyama, Yuji
    Lenaz, Davide
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kutyrev, Anton V.
    Cavallo, Alessandro
    Khedr, Mohamed Zaki
    Co-occurrence of compositionally variable chromitites in the Sabzevar ophiolite, NE Iran2023Ingår i: Lithos, ISSN 0024-4937, E-ISSN 1872-6143, Vol. 446-447, artikel-id 107133Artikel i tidskrift (Refereegranskat)
  • 47.
    Fregola, Rosa Anna
    et al.
    Università di Bari.
    Bosi, Ferdinando
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Cation ordering over short range and long range scales in the MgAl2O4-CuAl2O4 series2012Ingår i: American Mineralogist, ISSN 0003-004X, E-ISSN 1945-3027, Vol. 97, s. 1821-1827Artikel i tidskrift (Refereegranskat)
  • 48.
    Fregola, Rosa Anna
    et al.
    University of Bari.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Bosi, Ferdinando
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    D'Ippolito, Veronica
    Sapienza University of Rome.
    Andreozzi, Giovanni
    Sapienza University of Rome.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Optical absorption spectroscopy study of the causes for color variations in natural Fe-bearing gahnite: insights from iron valency and site distribution data.2014Ingår i: American Mineralogist, ISSN 0003-004X, E-ISSN 1945-3027, Vol. 99, s. 2187-2195Artikel i tidskrift (Refereegranskat)
  • 49.
    Gatta, G. D.
    et al.
    University of Milano.
    Bosi, Ferdinando
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    McIntyre, G. J.
    Australian Nuclear Science and Technology Organisation.
    Henrik, Skogby
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    First accurate location of two proton sites in tourmaline: A single-crystal neutron diffraction study of oxy-dravite2014Ingår i: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 78, nr 3, s. 681-692Artikel i tidskrift (Refereegranskat)
  • 50.
    Gori, Claudia
    et al.
    University of Parma, Italy.
    Tribaudino, Mario
    University of Parma, Italy.
    Mezzadri, Francesco
    University of Parma, Italy.
    Skogby, Henrik
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hålenius, Ulf
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Co2+-doped diopside: crystal structure and optical properties2018Ingår i: Physics and chemistry of minerals, ISSN 0342-1791, E-ISSN 1432-2021, Vol. 45, nr 5, s. 443-461Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Synthetic clinopyroxenes along the CaMgSi2O6– CaCoSi2O6 join were investigated by a combined chemical-structuralspectroscopic approach. Single crystals were synthesized by flux growth methods, both from Ca-saturated and Ca-deficient starting compositions. Single crystal structure refinements show that the incorporation of Co2+ at the octahedrally coordinated cation sites of diopside, increases the unit-cell as well as the M1 and the M2 polyhedral volumes. Spectroscopic investigations (UV–VIS–NIR) of the Ca-rich samples reveal three main optical absorption bands, i.e. 4T1g4T2g(F), 4T1g 4A2g(F) and 4T1g4T1g(P) as expected for Co2+ at a six-coordinated site. The bands arising from the 4T1g4T2g(F) and the 4T1g4T1g(P) electronic transitions, are each split into two components, due to the distortions of the M1 polyhedron from ideal Oh- symmetry. In spectra of both types, a band in the NIR range at ca 5000 cm−1 is caused by the 4A2g4T1g(F) electronic transition in Co2+ in a cubic field in the M2 site. Furthermore, an additional component to a band system at 14,000 cm−1, due to electronic transitions in Co2+ at the M2 site, is recorded in absorption spectra of Ca-deficient samples. No variations in Dq and Racah B parameters for Co2+ at the M1 site in response to compositional changes, were demonstrated, suggesting complete relaxation of the M1 polyhedron within the CaMgSi2O6– CaCoSi2O6 solid solution.

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