Germanite

Formula:  Cu₂₆Fe₄Ge₄S₃₂

Origin of name: After its content of the element Germanium.

Crystal system: Cubic/Isometric

Crystal class: 43m

Twinning: 

Unit cell: a = 10.5862

Colour: Brown, red gray, tarnishes to dull brown

Diaphaneity: Opaque

Luster: Metallic, dull

Habit: Euhedral crystals, granular, commonly massive, intergrown with reniérite

Hardness: 3

Specific gravity: 4.4-4.6

Cleavage: None

Tenacity: Brittle

Streak: Dark gray to black

Synonyms/varieties:

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