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Tsumoite

Year of discovery: 1978 (Japan as the first occurence in the World)

Locality list: 3 localities of tsumoite

• BiTe
• [Bi³⁺][Te]

• Class: Tsumoite group
• Class: Telluride

• Bi => Ag: Empressite
• Bi => Hg: Coloradoite
• Bi => Cu: Vulcanite
• Bi => Pb: Altaite

• Te => Se: Nevskite

• Te₂ => TeS: Ingodite

• Te₃ => Te₂S: Sulphotsumoite
• Te₃ => TeSe₂: Telluronevskite

• Color: Silver white
• Streak: Dark gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Tabular

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: 2.5-3
• Density: 8.2

• System: Trigonal
• Group: (-3)m, P(-3)m1
• Lattice: a=4.4, c=24.1

Etymology: Tsumo mine in Shimane prefecture, Japan, where this mineral was discovered for the first time.