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  • 1.
    Ali, Imran
    et al.
    Stockholms universitet.
    Kremer, Reinhard K.
    Skogby, Henrik
    Swedish Museum of Natural History, Department of Geology.
    Johnsson, Mats
    Synthesis and Magnetic Properties of the Ternary OxofluorideFe3Sb4O6F62020In: European Journal of Inorganic Chemistry, ISSN 1434-1948, E-ISSN 1099-1948, p. 3746-3752Article in journal (Refereed)
  • 2.
    Bonazzi, Paola
    et al.
    Università degli Studi di Firenze.
    Holtstam, Dan
    Swedish Museum of Natural History, Department of Geology.
    Bindi, Luca
    Università degli Studi di Firenze.
    Gatelite-supergroup minerals: recommended nomenclature and review2019In: European journal of mineralogy, ISSN 0935-1221, E-ISSN 1617-4011, Vol. 31, p. 173-181Article in journal (Refereed)
    Download full text (pdf)
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  • 3.
    Bosi, Ferdinando
    Swedish Museum of Natural History, Department of Geology.
    Bond valence at mixed occupancy sites. I. Regularpolyhedra2014In: ACTA CRYSTALLOGRAPHICA. SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS, ISSN 2052-5206, Vol. 70, p. 864-870Article in journal (Refereed)
  • 4.
    Bosi, Ferdinando
    Swedish Museum of Natural History, Department of Geology.
    Mean bond length variation in crystal structures: a bond valence approach2014In: ACTA CRYSTALLOGRAPHICA. SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS, ISSN 2052-5206, Vol. 70, p. 697-704Article in journal (Refereed)
  • 5.
    Karlsson, Andreas
    et al.
    Swedish Museum of Natural History, Department of Geology.
    Holtstam, Dan
    Swedish Museum of Natural History, Department of Geology.
    Bindi, Luca
    Dipartimento di Scienze della Terra, Università degli Studi di Firenze.
    Bonazzi, Poala
    Dipartimento di Scienze della Terra, Università degli Studi di Firenze.
    Konrad-Schmolke, Matthias
    Department of Earth Sciences, University of Gothenburg.
    Adding complexity to the garnet supergroup: monteneveite, Ca3Sb5+2(Fe3+2Fe2+)O12, a new mineral from the Monteneve mine, Bolzano Province, Italy2020In: European journal of mineralogy, ISSN 0935-1221, E-ISSN 1617-4011, Vol. 32, no 1, p. 77-87Article in journal (Refereed)
    Abstract [en]

    Monteneveite, ideally Ca3Sb5+2(Fe3+2Fe2+)O12, is a new member of the garnet supergroup (IMA2018-060). The mineral was discovered in a small specimen belonging to the Swedish Museum of Natural History coming from the now abandoned Monteneve Pb–Zn mine in Passiria Valley, Bolzano Province, Alto Adige (South Tyrol), Italy. The specimen consists of mainly magnetite, sphalerite, tetrahedrite-(Fe) and oxycalcioroméite. Monteneveite occurs as black, subhedral crystals with adamantine lustre. They are equidimensionaland up to 400 μm in size, with a subconchoidal fracture. Monteneveite is opaque, grey in reflected light,and isotropic under crossed polars. Measured reflectance values (%) at the four COM wavelengths are 12.6 (470 nm), 12.0 (546 nm), 11.6 (589 nm) and 11.4 (650 nm). The Vickers hardness (VHN100) is 1141 kg mm-2, corresponding to H = 6.5–7, and the calculated density is 4.72(1) g cm-3. A mean of 10 electron microprobe analyses gave (wt %) CaO 23.67, FeO 3.75, Fe2O3 29.54, Sb2O5 39.81, SnO2 2.22, ZnO 2.29, MgO 0.15, MnO 0.03 and CoO 0.03. The crystal chemical formula calculated on the basis of a total of eight cations and 12 anions, and taking into account the available structural and spectroscopic data, is (Ca2.97Mg0.03)Σ=3.00(Sb5+1.73Sn4+0.10Fe3+0.17)Σ=2.00(Fe3+2:43Fe2+0.37Zn0.20)Σ=3.00O12. The most significant chemical variations encounteredin the sample are related to a substitution of the type YSn4+ + ZFe3+  YSb5+ + ZFe2+. Mössbauer data obtained at RT and 77K indicate the presence of tetrahedrally coordinated Fe2+. Raman spectroscopy demonstrates that there is no measurable hydrogarnet component in monteneveite. The six strongest Bragg peaks in the powder X-ray diffraction pattern are [d (Å), I (%), (hkl)]: 4.45, 100, (220); 3.147, 60, (400); 2.814, 40, (420); 2.571, 80, (422); 1.993, 40, (620); 1.683, 60, (642). Monteneveite is cubic, space group Ia-3d, with a =12.6093(2) Å, V = 2004.8(1)Å3, and Z = 8. The crystal structure was refined up to R1 = 0.0197 for 305 reflections with Fo > 4σ (Fo) and 19 parameters. Monteneveite is related to the other Ca-, Sb- and Fe-bearing, nominally Si-free members of the bitikleite group, but it differs in that it is the only known garnet species with mixed trivalent and divalent cations (2:1) at the tetrahedral Z site. Textural and mineralogical evidence suggests that monteneveite formed during peak metamorphism (at ca. 600 ºC) during partial breakdown of tetrahedrite-(Fe) by reactions with carbonate, under relatively oxidizingconditions. The mineral is named after the type locality, the Monteneve (Schneeberg) mine.

  • 6.
    Lelis, Martynas
    et al.
    Lithuanian Energy Institute, Kaunas.
    Milcius, Darius
    Lithuanian Energy Institute, Kaunas.
    Wirth, Emmanuel
    Lithuanian Energy Institute, Kaunas.
    Hålenius, Ulf
    Swedish Museum of Natural History, Department of Geology.
    Eriksson, Lars
    Stockholms universitet.
    Jansson, Kjell
    Stockholms universitet.
    Kadir, Karim
    Stockholms universitet.
    Ruan, Juanfang
    Stockholms universitet.
    Sato, Toyoto
    Tokohu University.
    Yokosawa, Tadahiro
    National Institute of Material Sciences, Tsukuba.
    Noréus, Dag
    Stockholms universitet.
    A mechanically switchable metal–insulator transition in Mg2NiH4 discovers a strain sensitive, nanoscale modulated resistivity connected to a stacking fault2010In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 496, p. 81-86Article in journal (Refereed)
1 - 6 of 6
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