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Geigerite

Year of discovery: 1989 (Falotta, Switzerland), 1990 (Japan)

Locality list: 2 localities of geigerite

• Mn₅(AsO₄)₂(HAsO₄)₂,10H₂O
• [Mn²⁺₅][(HAsO₄)₂|(AsO₄)₂]^10-,10H₂O

• Class: Arsenate - Hydrate

• Mn => Mg: Chudobaite

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

• Cleavage: Perfect
• Hardness: 3
• Density: 3.1

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=7.9, b=10.7, c=6.8, α=81.0, β=84.2, γ=81.9