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Balangeroite

Year of discovery: 1983 (Poggio San Vittore mine, Italy), 2011 (Japan)

Locality list: A locality of balangeroite

• Mg₂₁Si₈O₂₇(OH)₂₀
• (Mg,Fe²⁺,Fe³⁺,Mn²⁺)₄₂Si₁₆O₅₄(OH)₄₀
• [Mg²⁺₂₁][(OH)₂₀|O₃|(Si₄O₁₂)₂]^42-

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

• Mg => Mn: Gageite

• Color: Yellowish brown, Dark brown
• Streak: Pale brown
• Luster: Vitreous
• Diaphaneity: Opaque

• Cleavage: Perfect
• Density: 3.0

• System: Triclinic (1A), Monoclinic (2M) (Layer-stacking polytype)
• Group: 2/m, P2/n
• Lattice: a=19.4, b=9.7, c=19.4, β=91.1