Formula: Cu2(Fe,Zn)GeS4
Origin of name: For Gaston Briart, who studied type locality, the Kipushi deposit
Crystal system: Tetragonal
Crystal class: 4 2m
Twinning: Polysynthetic common
Unit cell: a = 5.325 Å, c = 10.51 Å
Colour: Iron-gray, gray to gray-blue
Diaphaneity: Opaque
Luster: Dull metallic
Habit: Small grains, inclusions in sulfides
Hardness: 3.5 to 4
Specific gravity: 4.5
Cleavage: None
Synonyms/varieties:
Comments: Found as inclusions in other Ge-Ga-bearing sulfides
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