Ullmannite is a nickel antimony sulfide mineral with formula: NiSbS. Considerable substitution occurs with cobalt and iron in the nickel site along with bismuth and arsenic in the antimony site. A solid solution series exists with the high cobalt willyamite. ==Physical properties== Ullmannite is steel-gray to tin white in color with a metallic lus...
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• (n.) A brittle mineral of a steel-gray color and metallic luster, containing antimony, arsenic, sulphur, and nickel.
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Ullmannite, named after J. C. Ullman, the German chemist, is a brittle mineral of a steel-grey colour and metallic lustre, containing antimony, arsenic, sulphur, and nickel.
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http://www.probertencyclopaedia.com/browse/HU.HTM
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