Formula: Pb7(Cu,Ag)2Bi6S17
Origin of name: for Charles Stewart Ney (1918-1975 ), Canadian geologist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 37.527, b = 4.0705, c = 43.701, β = 108.801°
Colour: Lead-gray, tarnishes yellow, then Prussian blue
Diaphaneity: Opaque
Luster: Bright metallic
Habit: Crystals prismatic to bladed, as aggregates
Hardness: 2.5
Specific gravity: 7.02
Cleavage: None
Tenacity: Brittle, conchoidal fracture
Streak: Gray
Synonyms/varieties:
Comments:
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