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Browneite, MnS, a new sphalerite-group mineral from the Zakłodzie meteorite

Ma, Chi and Beckett, John R. and Rossman, George R. (2012) Browneite, MnS, a new sphalerite-group mineral from the Zakłodzie meteorite. American Mineralogist, 97 (11-12). pp. 2056-2059. ISSN 0003-004X. doi:10.2138/am.2012.4286.

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Browneite (IMA 2012-008), MnS, is a new member of the sphalerite group, discovered in Zakłodzie, an ungrouped enstatite-rich achondrite. The type material occurs as one single crystal (~16 μm in size) in contact with and surrounded by plagioclase; enstatite and troilite are nearby. Low-Ni iron, martensitic iron, tridymite, quartz, cristobalite, sinoite, schreibersite, buseckite, keilite, and graphite, are also present in the type sample. Browneite is yellowish brown and translucent. The mean chemical composition, as determined by electron microprobe analysis of the type material, is (wt%) S 36.46, Mn 62.31, Fe 0.62, Ca 0.10, sum 99.49, leading to an empirical formula calculated on the basis of 2 atoms of (Mn_(0.993)Fe_(0.010)Ca_(0.002))S_(0.995). Electron back-scatter diffraction patterns of browneite are a good match to that of synthetic β-MnS with the F43m structure, showing ɑ = 5.601 Å, V = 175.71 Å^3, and Z = 4. Browneite is a low-temperature (<200 °C) phase, metastable relative to alabandite, that postdates the impact melting and subsequent crystallization of an enstatite-rich rock.

Item Type:Article
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URLURL TypeDescription
Ma, Chi0000-0002-1828-7033
Rossman, George R.0000-0002-4571-6884
Additional Information:© 2012 Mineralogical Society of America. Manuscript received July 7, 2012. Manuscript accepted July 25, 2012. Manuscript handled by Ian Swainson. We appreciate the reviews by M. Kimura, F.M. McCubbin, A.E. Rubin, and D.J. Vaughan, which led to significant improvements in the manuscript. SEM, EBSD, and EPMA 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 research was also partially supported by NASA grant NNX09AG40G (E. Stolper, PI). Ed Stolper also provided the Zakłodzie meteorite sample for this study.
Funding AgencyGrant Number
NSF MRSEC ProgramDMR-0080065
Subject Keywords:Browneite, MnS, new mineral, sphalerite group, EBSD, Zakłodzie meteorite, enstatite achondrite
Issue or Number:11-12
Record Number:CaltechAUTHORS:20130116-074917825
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Official Citation:Chi Ma, John R. Beckett, and George R. Rossman Browneite, MnS, a new sphalerite-group mineral from the Zakłodzie meteorite American Mineralogist, November-December 2012, v. 97, p. 2056-2059, doi:10.2138/am.2012.4286
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36416
Deposited By: Ruth Sustaita
Deposited On:16 Jan 2013 17:47
Last Modified:09 Nov 2021 23:22

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