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Sillénite, Sillenite

Year of discovery: 1943 (Durango, Mexico), 1991 (Japan)

Locality list: 4 localities of sillénite

• Bi₁₂SiO₂₀
• [Bi³⁺₁₂][Si⁴⁺][O₂₀]^40-

• Class: Oxide

• Color: Grayish green, Yellowish green, Grayish brown
• Streak: Grayish green
• Luster: Waxy
• Diaphaneity: Transparent-Translucent

• Hardness: 1-2
• Density: 9.3

• System: Cubic
• Group: (-4)3m
• Lattice: a=10.2