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Talmessite

Year of discovery: 1960 (Talmessi mine, Iran), 2012 (Japan)

Locality list: A locality of talmessite

• Ca₂Mg(AsO₄)₂,2H₂O
• [Ca²⁺₂][Mg²⁺][(AsO₄)₂]^6-,2H₂O

• Class: Arsenate - Hydrate

• Polymorph: Wendwilsonite (Monoclinic)

• Mg => Zn: Gaitite (Series), Zincroselite
• Mg => Co: β-Roselite (Series), Roselite
• Mg => Ni: Nickeltalmessite
• Mg => Mn: Brandtite, Parabrandtite
• Mg => Cu: Ruffite

• AsO₄ => PO₄: Collinsite

• Color: White, Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Hardness: 5
• Density: 3.4

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=5.9, b=6.9, c=5.5, α=97.3, β=108.7, γ=108.1