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Arseniosiderite

Year of discovery: 1842 (Romanèche-Thorens, France), 1986 (Japan)

Locality list: 9 localities of arseniosiderite

• Ca₂Fe₃(AsO₄)₃O₂,3H₂O
• Ca₂(Fe,Mn)₃(AsO₄,PO₄)₃O₂,3H₂O
• [Ca²⁺₂][Fe³⁺₃][O₂|(AsO₄)₃]^13-,3H₂O

• Class: Mitridatite group
• Class: Oxide - Arsenate - Hydrate
• Soluble in: hot HCl, hot HNO₃, hot H₂SO₄

• FeAsO₄ => MnPO₄: Robertsite (Series), Pararobertsite

• AsO₄ => PO₄: Mitridatite (Series)

• 3H₂O => 2H₂O: Kolfanite

• Color: Yellow, Reddish brown
• Streak: Yellow
• Luster: Resinous
• Diaphaneity: Opaque

• Cleavage: Perfect on {001} (1 planes)
• Hardness: 4.5
• Density: 3.6

• System: Monoclinic
• Group: 2/m, A2/a
• Lattice: a=17.8, b=19.5, c=11.3, β=96.0