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Sogdianite

Year of discovery: 1968 (Darai-Pioz glacier, Tajikistan), 2012 (Japan)

Locality list: A locality of sogdianite

• KLi₃Zr₂Si₁₂O₃₀
• K([],Na)₂Li₃(Zr,Fe,Ti)₂Si₁₂O₃₀
• [K⁺][]₂[Li⁺₃][Zr⁴⁺₂][(Si₂O₅)₆]^12-

• Class: Milarite group
• Class: Cyclosilicate (Double ring)
• Radioactive: Very weak

• Zr => Sn: Brannockite
• Zr => Ti: Berezanskite

• []Zr => NaFe: Sugilite
• []Zr => NaAl: Aluminosugilite

• Color: Purple
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: 7
• Density: 2.9

• System: Hexagonal
• Group: 6/mmm, P6/mmm
• Lattice: a=10.1, c=14.2