Formula: NiAs2
Origin of name: for Karl Rammelsberg, German chemist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: tin-white with pinkish tint
Diaphaneity: opaque
Luster: metallic
Habit: crystals short prismatic to 1 mm, massive, fine granular to prismatic or radial-fibrous structure
Hardness: 5.5 to 6
Specific gravity: 6.97
Cleavage: 1; {101} distinct
Tenacity:
Streak: grayish-black
Synonyms/varieties:
Comments: trimorphous with pararammelsbergite and krutovite
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