Formula: Ni3(Bi,Pb)2S2
Origin of name: for R. Parker, Swiss mineralogist
Crystal system: monoclinic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: bronze
Diaphaneity: opaque
Luster: metallic
Habit: massive, minute grains
Hardness: 2
Specific gravity: 8.4
Cleavage: 1; {010} excellent
Tenacity:
Streak: black
Synonyms/varieties:
Comments:
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