Capgaronnite

Formula:  HgS . Ag(Cl,Br,I)

Origin of name:  From locality; Cap Garonne, France

 

Crystal system:  Orthorhombic

Crystal class:  222

Twinning:

Unit cell:

 

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

Hardness:

Specific gravity:

Cleavage:  1; {010} perfect

Tenacity:

Streak:  Black-grey

 

Synonyms/varieties:

 

Comments:

 

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