Abstract
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.
Acknowledgments
We thank V. Tsurkan for providing a synthesized FeCr2S4 crystal that greatly facilitated analysis of the new mineral by EPMA. We are grateful to F.T. Kyte and R. Esposito for their patience and for technical support with the electron microprobe. We thank K.D. McKeegan for useful suggestions about finding inclusions in iron meteorites. We also thank J.T. Wasson for comments on the manuscript. Helpful reviews and suggestions were provided by T.J. McCoy, K. Keil, P.R. Buseck, and Associate Editor S.B. Simon. SEM and EBSD analyses were carried out at the Caltech Analytical Facility at the Division of Geological and Planetary Sciences, which is supported, in part, by grant NSF EAR-0318518 and the MRSEC Program of the NSF under DMR-0080065. This work was supported in part by NASA grant NNX14AF39G (A.E. Rubin).
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