Formula: Cu4(As,Sb)2S5
Origin of name: for Takeo Watanabe (1907-1986), professor of mineralogy, University of Tokyo (1944-1968), Nagoya University (1968-1971), President of the Akita University (1971-1976).
Crystal system: Orthorhombic
Crystal class: unknown
Twinning:
Unit cell: a = 14.51, b = 13.3, c = 17.96
Colour: Silvery to lead gray
Diaphaneity: Opaque
Luster: Metallic
Habit: nearly rectangular or elongated grains up to 50 micron, anhedral
Hardness: 4-4.5
Specific gravity: 4.66
Cleavage: None
Tenacity:
Streak: Lead-gray
Synonyms/varieties:
Comments: megascopically indistinguishable from tetrahedrite
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