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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. It is steel-gray to tin white in colour with a metallic luster. It has a Mohs hardness of 5 to 5.5 and a specific gravity of 6.65. It crystallizes in the isometric crystal class and typically exhibits cubic, octahedral, or pyritohedral forms although euhedral crystals are rare. Crystal twinning is common.
Additional recommended knowledge
Principal localities are in Germany, it is also found in Austria, Australia, France, England, and Wales.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ullmannite". A list of authors is available in Wikipedia.|