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Gageite

Year of discovery: 1910 (Franklin mine, USA), 1979 (Japan)

Locality list: 39 localities of gageite

• Mn₂₁Si₈O₂₇(OH)₂₀
• (Mn,Mg,Zn)₂₁Si₈O₂₇(OH)₂₀
• [Mn²⁺₂₁][(OH)₂₀|O₃|(Si₄O₁₂)₂]^42-

• Class: Gageite group
• Class: Inosilicate (Single) - Oxide - Hydroxide

• Mn => Mg: Balangeroite

• Color: Colorless, Pale brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Fibrous

• Cleavage: Distinct on {110} (1 plane)
• Hardness: 3
• Density: 3.6

• System: Triclinic (1A), Monoclinic (2M) (Layer-stacking polytype)
• Group (1A): (-1), P(-1)
• Group (2M): 2/m, P2/n
• Lattice (1A): a=14.2, b=14.1, c=9.8, α=76.5, β=76.6, γ=86.9
• Lattice (2M): a=19.4, b=19.4, c=9.8, β=89.5