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Browneite, MnS; a new sphalerite-group mineral from the Zaklodzie Meteorite

Chi Ma, John R. Beckett and George R. Rossman
Browneite, MnS; a new sphalerite-group mineral from the Zaklodzie Meteorite
American Mineralogist (November 2012) 97 (11-12): 2056-2059


Browneite (IMA 2012-008), MnS, is a new member of the sphalerite group, discovered in Zaklodzie, an ungrouped enstatite-rich achondrite. The type material occurs as one single crystal ( approximately 16 mu m 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 (sub 0.993) Fe (sub 0.010) Ca (sub 0.002) )S (sub 0.995) . Electron back-scatter diffraction patterns of browneite are a good match to that of synthetic beta -MnS with the F43m structure, showing a=5.601 Aa, V=175.71 Aa (super 3) , and Z=4. Browneite is a low-temperature (<200 degrees C) phase, metastable relative to alabandite, that postdates the impact melting and subsequent crystallization of an enstatite-rich rock.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 97
Serial Issue: 11-12
Title: Browneite, MnS; a new sphalerite-group mineral from the Zaklodzie Meteorite
Affiliation: California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States
Pages: 2056-2059
Published: 201211
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 40
Accession Number: 2013-004035
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201303
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