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Tiragalloite

Year of discovery: 1979 (Molinello mine, Italy), 2005 (Japan)

Locality list: A locality of tiragalloite

• Mn₄HAsSi₃O₁₃
• [Mn²⁺₄][HAs⁵⁺Si₃O₁₃]^8-

• Class: Soro-Arsenosilicate

• Color: Orange
• Streak: White
• Luster: Sub-Adamantine

• Cleavage: Good on {100} (1 plane), Parting
• Density: 3.8

• System: Monoclinic
• Group: 2/m, P2₁/n
• Lattice: a=6.7, b=19.9, c=7.7, β=95.7