Uchuccacuaite

Formula: AgPb₃MnSb₅S₁₂

Origin of name: after locality Uchuc-Chacua deposit, Cajatambo Province, Peru

Crystal system: Orthorhombic?, likely monoclinic, pseudo-orthorhombic

Crystal class: 222 or mm2 or 2/m 2/m 2/m

Twinning: Common, polysynthetic along one direction

Unit cell: a = 12.67, b = 19.32, c = 4.38

Colour: Lead gray

Diaphaneity: Opaque

Luster: Metallic

Habit: Subhedral crystals and anhedral grains, to 200 micron, crystals usually twinned

Hardness: 3.5

Specific gravity: 5.16

Cleavage: 

Tenacity: 

Streak: 

Synonyms/varieties:

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