Formula: (Pt,Pb)Bi3(S,Se)4-x
Origin of name: For David Crear, American geologist
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: Whitish gray in reflected light
Diaphaneity: Opaque
Luster: Metallic
Habit: Anhedral grains mostly <50 µm
Hardness: ~ 3
Specific gravity: 7.75
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Known from polished section only
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