Formula: (Cu,Zn,Ag)12(As,Sb)4(Se,S)13
Origin of name: For Roger Giruad, French microscopist
Crystal system: Cubic
Crystal class: -43m
Twinning:
Unit cell:
Colour: Light gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Grains, submicroscopic
Hardness:
Specific gravity: 5.75
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Polished section only
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