Joegoldsteinite: A new sulfide mineral (MnCr2S4) from the Social Circle IVA iron meteorite

1Junko Isa, 2Chi Ma, 1,3Alan E. Rubin
1Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, California 90095, U.S.A.
2Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, U.S.A.
3Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095, U.S.A.

Joegoldsteinite, a new sulfide mineral of end-member formula MnCr2S4, was discovered in the Social Circle IVA iron meteorite. It is a thiospinel, the Mn analog of daubréelite (Fe2+Cr2S4), and a new member of the linnaeite group. Tiny grains of joegoldsteinite were also identified in the Indarch EH4 enstatite chondrite. The chemical composition of the Social Circle sample determined by electron microprobe is (wt%) S 44.3, Cr 36.2, Mn 15.8, Fe 4.5, Ni 0.09, Cu 0.08, total 101.0, giving rise to an empirical formula of (Mn0.82Fe0.23)Cr1.99S3.95. The crystal structure, determined by electron backscattered diffraction, is a Fd3m spinel-type structure with a = 10.11 Å, V = 1033.4 Å3, and Z = 8.

Reference
Isa J, Ma C, Rubin AE (2016) Joegoldsteinite: A new sulfide mineral (MnCr2S4) from the Social Circle IVA iron meteorite. American Mineralogist 101,1217-1221
Link to Article [http://dx.doi.org/10.2138/am-2016-5594]
Copyright: The Mineralogical Society of America

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