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Macfallite

Year of discovery: 1974 (Copper Harbor, USA), 1998 (Japan)

Locality list: A locality of macfallite

• Ca₂Mn₃Si₃O₁₁(OH)₃
• Ca₂(Mn,Al)₃Si₃O₁₁(OH)₃
• [Ca²⁺₂][Mn³⁺₃][(OH)₃|SiO₄|Si₂O₇]^13-

• Class: Sorosilicate - Nesosilicate - Hydroxide

• Ca₂Mn₃ => Mn₂Al₃: Sursassite

• Color: Reddish brown
• Streak: Brown
• Luster: Silky
• Diaphaneity: Translucent

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 5
• Density: 3.4

• System: Monoclinic
• Group: 2/m, P2₁/m
• Lattice: a=10.2, b=6.1, c=9.0, β=110.8