Formula: NiAs2
Origin of name: from Greek para = similar and rammelsbergite
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: tin-white
Diaphaneity: opaque
Luster: metallic
Habit: crystals rectangular tablets, poorly developed, massive, reniform
Hardness: about 5
Specific gravity: 7.25
Cleavage: 1; {001} perfect
Tenacity:
Streak: grayish black
Synonyms/varieties:
Comments: trimorphous with rammelsbergite and krutovite
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