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Tamaite (Photo)

Year of discovery: 2000 (Japan as the first occurence in the World)

Locality list: 2 localities of tamaite

• CaMn₈AlSi₁₁O₂₉(OH)₇,nH₂O
• (Ca,K,Ba,Na)_3-4Mn₂₄(Si,Al)₄₀(O,OH)₁₁₂,21H₂O
• [Ca²⁺][Mn²⁺₈][(OH)₇|AlSi₁₁O₂₉]^18-,nH₂O

• Class: 2:1 layer, Strip-Tetrahedral < Modulated hydrous < Phyllosilicate subclass < Silicate class
• Class: Phyllo-Aluminosilicate - Hydroxide - Hydrate
• Radioactive: Very weak

• Ca => K₂: Ganophyllite
• Ca => Na₂: Eggletonite

• Color: Colorless, Pale yellowish brown
• Streak: White
• Luster: Vitreous
• Diaphaneity; Transparent

• Habit: Tabular

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 4
• Density: 2.9

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=16.6, b=27.1, c=25.4, β=98.7

Etymology: Tama distinct, the address of Shiromaru mine where this mineral was discovered for the first time.