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Polylithionite

Year of discovery: 1884 (Kangerluarsuk Fjord, Greenland), 2000 (Japan)

Locality list: A locality of polylithionite

• KLi₂AlSi₄O₁₀F₂
• KLi₂AlSi₄O₁₀(F,OH)₂
• [K⁺][Li⁺₂][Al³⁺][F₂|(Si₂O₅)₂]^6-

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

• K => Cs: Sokolovaite

• LiAl => Mg₂: Tainiolite

• Li₂Al => Fe_1.5Mn_0.5Mg_0.5: Montdorite
• Li₂Al => NaMg₂: Shirokshinite

• LiSi => Mn: Masutomilite

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

• Li₂Si₂ => Fe₂Al₂: Siderophyllite

• Color: Pale purple, White, Gray
• Streak: White
• Luster: Pearly
• Diaphaneity: Transparent

• Habit: Thin platy

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 2-3
• Density: 2.7

• System: Monoclinic
• Group: 2, C2
• Lattice: a=5.3, b=9.1, c=10.1, β=100.7