Formula: CuI
Origin of name: For C.W. Marsh, mineralogist
Crystal system: Cubic
Crystal class: -43m
Twinning: On {110}, may be repeated
Unit cell: a = 6.051Å
Colour: Colourless to pale yellow, yellowish pink to dark brownish red
Diaphaneity:
Luster: Adamantine
Habit: Crystals tetrahedral or cubo-octahedral; crusts
Hardness: 2.5
Specific gravity: 5.68
Cleavage: 1; {011} perfect
Tenacity: Conchoidal; brittle
Streak: Yellow
Synonyms/varieties:
Comments: Fluoresces dark red
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