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Trilithionite (Photo)

Year of discovery: 1960 (World), 2000 (Japan)

Locality list: 2 localities of trilithionite

• KLi_1.5Al_2.5Si₃O₁₀F₂
• K(Li,Al)₃AlSi₃O₁₀(F,OH)₂
• [K⁺][Li⁺_1.5][Al³⁺_1.5][F₂|AlSi₃O₁₀]^7-

• Class: Lepidolite series < Trioctahedral < True mica group < Mica supergroup
• Class: Phyllo-Aluminosilicate - Fluoride
• Soluble in: HCl
• Fluorescence: Short UV excitation (Bluish green-Purple), Triboluminescence (Reddish purple, by cleaving)
• Radioactive: Very weak

• Al_1.5 => Li_0.5Si: Polylithionite (Series)

• Li_0.5Al_0.5 => Mn: Masutomilite

• Li_1.5Al_1.5 => Fe₃: Fluorannite
• Li_1.5Al_1.5 => Mg₃: Fluorophlogopite

• Color: Pale purple, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Thin platy

• Cleavage: Perfect on {001} (1 plane)

• System: Monoclinic
• Group: 2/m, C2/c
• Lattice: a=9.1, b=5.2, c=20.3, β=99.6