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Aspidolite

Year of discovery: 2003 (Japan as the first occurence in the World)

Locality list: A locality of aspidolite

• NaMg₃AlSi₃O₁₀(OH)₂
• [Na⁺][Mg²⁺₃][(OH)₂|AlSi₃O₁₀]^7-

• Class: Trioctahedral < True mica group < Mica supergroup
• Class: Phyllo-Aluminosilicate - Hydroxide
• Radioactive: Very weak

• Na => K: Phlogopite

• MgSi => Al₂: Preiswerkite

• Color: Pale brown, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 2-3

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=5.3, b=9.2, c=10.1, β=105.1