Formula: (Cu,Fe)S2
Origin of name: For N. Fukuchi, Japanese mineralogist
Crystal system: Cubic
Crystal class: 2/m -3
Twinning:
Unit cell:
Colour: Dark brownish gray
Diaphaneity:
Luster: Submetallic
Habit: Minute grains
Hardness: ~ 6
Specific gravity: 4.80
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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