Stibnite, sometimes called antimonite, is a sulfide mineral with the formula Sb2S3. This soft grey material crystallizes in an orthorhombic space group. It is the most important source for the metalloid antimony. The name is from the Greek stibi through the Latin stibium as the old name for the mineral and the element antimony. As an antimony sulfide, it is potentially toxic and should be handled with care. Stibnite has a structure similar to that of arsenic trisulfide, As2S3. The Sb(III) centers, which are pyramidal and three-coordinate, are linked via bent two-coordinate sulfide ions. It is grey when fresh, but can turn superficially black due to oxidation in air. Pastes of Sb2S3 powder in fat or in other materials have been used since ca. 3000 BC as eye cosmetics in the Middle East...'
Contributions by Vsmith, 18.104.22.168, and Filll.