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Kesebolite-(Ce), CeCa2Mn(AsO4)[SiO3]3, a new REE-bearing arsenosilicate mineral from the Kesebol mine, Åmål, Västra Götaland, Sweden
Swedish Museum of Natural History, Department of Geology.ORCID iD: 0000-0003-2109-2277
University of Florence.
Swedish Museum of Natural History, Department of Geology.ORCID iD: 0000-0002-5390-0577
Swedish Museum of Natural History, Department of Geology.
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2020 (English)In: Minerals, E-ISSN 2075-163X, Vol. 10, no 385, p. 1-14Article in journal (Refereed) Published
Abstract [en]

Kesebolite-(Ce), ideal formula CeCa2Mn(AsO4)[SiO3]3, is a new mineral (IMA No. 2019-097) recovered from mine dumps at the Kesebol Mn-(Fe-Cu) deposit in Västra Götaland, Sweden. It occurs with rhodonite, baryte, quartz, calcite, talc, andradite, rhodochrosite, K-feldspar, hematite,gasparite-(Ce), chernovite-(Y) and ferriakasakaite-(Ce). It forms mostly euhedral crystals, with lengthwise striation. The mineral is dark grayish-brown to brown, translucent, with light brown streak. It is optically biaxial (+), with weak pleochroism, and ncalc = 1.74. H = 5–6 and VHN100 = 825. Fair cleavage is observed on {100}. The calculated density is 3.998(5) g/cm-3. Kesebolite-(Ce) ismonoclinic, P21/c, with unit-cell parameters from X-ray single-crystal diffraction data: a = 6.7382(3), b = 13.0368(6), c = 12.0958(6) Å, beta = 98.578(2) degr., and V = 1050.66(9) Å3, with Z = 4. Strongest Braggpeaks in the X-ray powder pattern are: [I(%), d(Å) (hkl)] 100, 3.114 (20-2); 92, 2.924 (140); 84, 3.138(041); 72, 2.908 (014); 57, 3.228 (210); 48, 2.856 (042); 48, 3.002 (132). The unique crystal structure wassolved and refined to R1 = 4.6%. It consists of 6-periodic single silicate chains along (001); these are interconnected to infinite (010) strings of alternating, corner-sharing MnO6 and AsO4 polyhedra, altogether forming a trellis-like framework parallel to (100).

Place, publisher, year, edition, pages
2020. Vol. 10, no 385, p. 1-14
Keywords [en]
kesebolite-(Ce), new mineral, crystal structure, arsenosilicate, rare earth elements, cerium anomaly, skarn, Sweden
National Category
Geology
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-4035DOI: 10.3390/min10040385OAI: oai:DiVA.org:nrm-4035DiVA, id: diva2:1510584
Available from: 2020-12-16 Created: 2020-12-16 Last updated: 2024-01-17Bibliographically approved

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