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Sursassite

Year of discovery: 1926 (Parsettens Alp, Switzerland), 1987 (Japan)

Locality list: 10 localities of sursassite

• Mn₂Al₃Si₃O₁₁(OH)₃
• [Mn²⁺₂][Al³⁺₃][(OH)₃|SiO₄|Si₂O₇]^13-

• Class: Sorosilicate - Nesosilicate - Hydroxide

• Mn => Ca: Pumpellyite-(Al)

• Mn₂Al₃ => Ca₂Mn₃: Macfallite

• Color: Reddish brown, Orange
• Streak: Yellowish brown
• Luster: Silky
• Diaphaneity: Translucent

• Cleavage: Distinct on {101} (1 plane)
• Density: 3.3

• System: Monoclinic
• Group: 2/m, P2₁/m
• Lattice: a=8.7, b=5.8, c=9.8, β=108.9