Formula: Pb2Cu(Pb,Bi)Bi2S7
Origin of name: for E. Nuffield, Canadian mineralogist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: lead-gray to steel-gray, tarnishes pale iridescent grayish green to reddish brown
Diaphaneity: opaque
Luster: bright metallic
Habit: crystals prismatic to acicular, deeply striated, bundles of crystals or subparallel aggregates
Hardness: 3.5
Specific gravity: 7.01
Cleavage: 2; parallel to [001] excellent, normal to [001] indistinct
Tenacity:
Streak: dark greenish gray to black
Synonyms/varieties:
Comments:
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