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Taneyamalite

Year of discovery: 1981 (Japan as the first occurence in the World)

Locality list: 12 localities of taneyamalite

• NaMn₁₂Si₁₂O₃₁(OH)₁₃
• (Na,Ca)(Mn,Mg,Fe)₁₂(Si,Al)₁₃(O,OH)₄₄
• [Na⁺][Mn²⁺₁₀][Mn³⁺₂][(OH)₁₃|Si₁₂O₃₁]^27-

• Class: Howieite group
• Class: Inosilicate (Single chain) - Hydroxide

• Mn => Fe: Hawieite

• Color: Grayish yellow green, Brown
• Streak: Pale yellow
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Fibrous, Platy

• Cleavage: Perfect on {010} (1 plane), Distinct on {100} (1 plane)
• Hardness: 5-6
• Density: 3.3

• System: Triclinic
• Group: 1, P1
• Lattice: a=10.2, b=9.8, c=9.5, α=90.5, β=70.5, γ=108.6

Etymology: Taneyama mine in Kumamoto prefecture, Japan, where this mineral was discovered for the first time.