Formula: HgS . Ag(Cl,Br,I)
Origin of name: From locality; Cap Garonne, France
Crystal class: 222
Colour: Black
Diaphaneity: Translucent to opaque
Luster: Sub-adamantine-sub-metallic
Habit: Prismatic crystals 0.02 x 0.1 mm in small tufted aggregates or single crystals
Cleavage: 1; {010} perfect
Streak: Black-grey
Synonyms/varieties:
Comments:
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