Formula: Pb2Cu12O15(Cl,Br)2
Origin of name: For J. Murdoch, American mineralogist
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning: Common
Unit cell: a = 9.21 Ǻ
Colour: Black
Diaphaneity:
Luster: Vitreous
Habit: Crystals cubes and octahedrons, minute
Hardness: 4
Specific gravity: 6,47
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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