Treasurite

Formula: Ag₇Pb₆Bi₁₅S₃₂

Origin of name: after locality Treasure Vault lode, Park Co, Colorado, U.S.A.

Crystal system: Monoclinic

Crystal class: 2/m

Twinning:

Unit cell: a = 26.538, b = 4.092, c = 13.349, β = 92.77°

Colour: Black, metallic gray

Diaphaneity: Opaque

Luster: Metallic

Habit: Aggregates 1 by 1.5 mm, granular

Hardness: 

Specific gravity: 7.25

Cleavage: none

Tenacity: 

Streak: 

Synonyms/varieties:

Comments:  Found in hydrothermal vein material.