Formula: (Ni,Co,Cu)Se2
Origin of name: for R. Penrose, American geologist
Crystal system: cubic
Crystal class: 2/m -3
Twinning:
Unit cell:
Colour: steel-gray, tarnishes to dull lead-gray
Diaphaneity: opaque
Luster: metallic
Habit: massive, granular, botryoidal or reniform with radiating columnar structure
Hardness: 2.5 to 3
Specific gravity: 6.58 to 6.74
Cleavage: 2; {001} perfect, {011} distinct
Tenacity:
Streak: black
Synonyms/varieties:
Comments:
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