[ Top ] [ Japanese ]

Sugilite

Year of discovery: 1975 (Japan as the first occurence in the World)

Locality list: 2 localities of sugilite

• KNa₂Li₃Fe₂Si₁₂O₃₀
• K(Na,[])₂Li₃(Fe³⁺,Mn³⁺,Al)₂Si₁₂O₃₀
• [K⁺][Na⁺₂][Li⁺₃][Fe³⁺₂][(Si₂O₅)₆]^12-

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

• Fe => Al: Aluminosugilite

• NaFe => Sn: Brannockite
• NaFe => Ti: Berezanskite
• NaFe => []Zr: Sogdianite

• Fe₂Li₃ => B₃: Poudretteite

• Color: Pale yellowish brown, Purple
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Tranlucent

• Cleavage: Indistinct on {0001} (1 plane)
• Hardness: 6-6.5
• Density: 2.7

• System: Hexagonal
• Group: 6/mmm, P/mcc
• Lattice: a=10.0, c=14.0

Etymology: Ken-ichi Sugi (1901-1948), Japanese petrogist