a soft mineral, antimony sulfide, Sb2S3, lead-gray in color with a metallic luster, occurring in crystals, often acicular, or in bladed masses: the most important ore of antimony.
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It crystallizes in the orthorhombic system and is isomorphous with stibnite (Sb2S3), which it closely resembles in appearance.
When prepared in this way they are orange-colored substances, though the mineral stibnite is black.
The antimony sulphide, stibnite, is the source of most of the world's production of this metal.
The commercial ore of this metal is the sulphide known as stibnite, or gray antimony.
Although antimony occurs in many minerals, the only commercial source is the sulphide, stibnite.