Formula: NiS
Origin of name: For W. Miller, British mineralogist
Crystal system: Hexagonal
Crystal class: 3m
Twinning: On {01-12} by pressure
Unit cell: a = 9.62 Å, c = 3.15 Å
Colour: Brass-yellow, bronze-yellow; tarnishes greenish gray
Diaphaneity:
Luster: Metallic
Habit: Crystals slender acicular to capillary, elongated on c-axis; in radiating groups; fibrous masses; massive, cleavable
Hardness: 3 to 3.5
Specific gravity: 5.41 to 5.42
Cleavage: 2; {01-12} and {10-11} perfect
Tenacity: Uneven; brittle
Streak: Greenish black
Synonyms/varieties:
Comments:
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