Formula: (Cu,Hg,Ag)12Sb4(Se,S)13
Origin of name: For Jaroslav Hak, Czech mineralogist
Crystal system: Cubic
Crystal class: -43m
Twinning:
Unit cell:
Colour: Grey-brown
Diaphaneity: Opaque
Luster: Metallic
Habit: Massive; microscopic zenomorphic grains
Hardness: 4.5
Specific gravity: 6.3
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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