Formula: Cu0-1Pb7.5Bi9.3-9.7(S,Se)22
Origin of name: for J. Proud, Australian mine director
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: silver-gray
Diaphaneity: opaque
Luster:
Habit: elongate to acicular grains, irregular laths
Hardness: 2 to 4
Specific gravity: 7.12
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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