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Robertsite

Year of discovery: 1974 (Tip Top mine, USA), 2017 (Japan)

Locality list: A locality of robertsite

• Ca₂Mn₃(PO₄)₃O₂,3H₂O
• [Ca²⁺₂][Mn³⁺₃][O₂|(PO₄)₃]^13-,3H₂O

• Class: Mitridatite group
• Class: Oxide - Phosphate - Hydrate

• Polymorph: Pararobertsite (2/m)

• Mn => Fe: Mitridatite

• MnPO₄ => FeAsO₄: Arseniosiderite (Series)

• Color: Red, Reddish brown
• Streak: Reddish brown
• Luster: Resinous
• Diaphaneity: Translucent

• Cleavage: Perfect on {100} (1 planes)
• Hardness: 3.5
• Density: 3.1

• System: Monoclinic
• Group: m, Bb
• Lattice: a=17.3, b=19.4, c=11.3, β=96.6