Formula: NiSbS
Origin of name: for J. Ullmann, German chemist
Crystal system: cubic
Crystal class: 23
Twinning: on {001} obut [110] axis, penetration
Unit cell: a = 5.88 Å
Colour: tin-white to steel-gray
Diaphaneity: opaque
Luster: metallic
Habit: crystals cubic, octahedral, pyritohedral or tetrahedral, striations on cube face, massive, granular
Hardness: 5 to 5.5
Specific gravity: 6.65
Cleavage: 1; {001} perfect
Tenacity: uneven, brittle
Streak: grayish black
Synonyms/varieties:
Comments: series with willyamite
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