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Ganophyllite (Photo)

Year of discovery: 1890 (Harstigen mine, Sweden), 1952 (Japan)

Locality list: 30 localities of ganophyllite

• K₂Mn₈AlSi₁₁O₂₉(OH)₇,8-9H₂O
• (K,Na,Ca)₂(Mn,Al,Mg)₈(Si,Al)₁₂O₂₉(OH)₇,8-9H₂O
• [K⁺₂][Mn²⁺₈][(OH)₇|AlSi₁₁O₂₉]^18-,8-9H₂O

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

• K => Na: Eggletonite

• K₂ => Ca: Tamaite

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

• Habit: Platy

• Cleavage: Perfect (1 plane)
• Hardness: 4-4.5
• Density: 2.8

• System: Monoclinic
• Group: 2/m, A2/a
• Lattice: a=16.6, b=27.1, c=50.2, β=94.0