Eskimoite

Formula: Ag₇Pb₁₀Bi₁₅S₃₆

Origin of name:   For Eskimo people, Greenland

Crystal system:   Monoclinic

Crystal class:   m or 2/m

Twinning:

Unit cell: a = 30.194, b = 4.1, c = 13.459, β = 93.35°

Colour:  Black, gray, when polished metallic-white

Diaphaneity:  Opaque

Luster: Metallic

Habit:   Lamellar grains about 0.5 mm

Hardness:   4

Specific gravity:   7.10

Cleavage:   None

Tenacity: 

Streak: 

Synonyms/varieties:

Comments: