Formula: (Cu,Ag)6PbS4
Origin of name: After locality; Furutobe mine, Akita, Japan
Crystal system: Monoclinic
Crystal class: m
Twinning:
Unit cell: a = 20.025, b = 3.963, c = 9.705, β = 101.57°
Colour: Gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Grains, submicroscopic
Hardness: 3
Specific gravity: 6.74
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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