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Kesebolite-(Ce), CeCa2Mn(AsO4) SiO3 (3), a New REE-Bearing Arsenosilicate Mineral from the Kesebol Mine, angstrom mal, Vastra Gotaland, Sweden

Journal article
Authors D. Holtstam
L. Bindi
A. Karlsson
J. Langhof
Thomas Zack
P. Bonazzi
A. Persson
Published in Minerals
Volume 10
Issue 4
Pages 14
ISSN 2075-163X
Publication year 2020
Published at Department of Earth Sciences
Pages 14
Language en
Links dx.doi.org/10.3390/min10040385
Keywords kesebolite-(Ce), new mineral, crystal structure, arsenosilicate, rare, earth elements, cerium anomaly, skarn, Sweden, (as5+,v5+,si4+)o-4 tetrahedra, crystal-chemistry, langban, medaite, deposit, Mineralogy, Mining & Mineral Processing
Subject categories Earth and Related Environmental Sciences

Abstract

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 Vastra Gotaland, 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 n(calc) = 1.74. H = 5-6 and VHN100 = 825. Fair cleavage is observed on {100}. The calculated density is 3.998(5) gcm(-3). Kesebolite-(Ce) is monoclinic, P2(1)/c, with unit-cell parameters from X-ray single-crystal diffraction data: a = 6.7382(3), b = 13.0368(6), c = 12.0958(6) angstrom, beta = 98.578(2)degrees, and V = 1050.66(9) angstrom(3), with Z = 4. Strongest Bragg peaks in the X-ray powder pattern are: [I(%), d(angstrom) (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 was solved 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).

Page Manager: Webmaster|Last update: 9/11/2012
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