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Paraguanajuatite

Year of discovery: 1948 (Santa Catarina mine, Mexico), 1961 (Japan)

Locality list: 2 localities of paraguanajuatite

• Bi₂Se₃
• Bi₂(Se,S)₃
• [Bi³⁺₂][Se₃]^6-

• Class: Tetradymite group
• Class: Selenide

• Polymorph: Guanajuatite (Orthorhombic)

• Bi => Sb: Antimonselite

• Se => Te: Tellurobismuthite
• Se => S: Bismuthinite

• Se₃ => Te₂S: Tetradymite
• Se₃ => Te₂Se: Kawazulite
• Se₃ => TeSe₂: Skippenite

• Color: Dark gray
• Streak: Gray
• Luster: Metallic
• Diaphaneity: Opaque

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: 2.5-3
• Density: 6.6

• System: Trigonal
• Group: (-3)m, R(-3)m
• Lattice: a=4.1, c=28.6