Formula: (Ag,Cu,Pb,Bi)11S13
Origin of name: For William Mumme, Australian mineralogist
Crystal system: Monoclinic
Crystal class: m or 2/m
Twinning:
Unit cell:
Colour: Light gray
Diaphaneity:
Luster:
Habit: Short columnar crystals < 1 mm in aggregates
Hardness: 3.5
Specific gravity: 6.79
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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