『Abstract
　Browneite (IMA 2012-008), MnS, is a new member of the sphalerite group, discovered in Zaklodzie（iには短い/が重なる), an ungrouped enstatite-rich achondrite. The type material occurs as one single crystal (〜16μm 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 35.46, 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 (Mn0.993Fe0.010Ca0.002)S0.995. Electron back-scatter diffraction patterns of browneite are a good match to that of synthetic β-MnS with the F43m（4の頭に-） structure, showing a = 5.601Å, V = 175.71 A³, and Z = 4. Browneite is a low-temperature (＜200℃) phase, metastable relative to alabandite, that postdates the impact melting and subsequent crystallization of an enstatite-rich rock.

Keywords: Browneite; MnS; new mineral; sphalerite group; EBSD; Zaklodzie（iには短い/が重なる) meteorite; enstatite achondrite』

Introduction
Mineral name and type material
Appearance, physical and optical properties
Chemical composition
Crystallography
Occurrence and associated minerals
Origin and significance
Acknowledgments
References cited