[ Top ] [ Japanese ]

Alluaudite

Year of discovery: 1847 (Varuträsk, Sweden), 1980 (Japan)

Locality list: A locality of alluaudite

• NaMnFe₂(PO₄)₃
• Na([],Ca,Mg)Mn(Fe³⁺,Mn²⁺,Fe²⁺)₂(PO₄)₃
• [Na⁺][][Mn²⁺][Fe³⁺₂][(PO₄)₃]^9-

• Class: Alluaudite group
• Class: Phosphate
• Soluble in: HCl, HNO₃, H₂SO₄
• Alter to Heterosite and Purpurite.

• [] => Ca: Hagendorfite
• [] => Mg: Maghagendorfite

• []Fe₂ => CaMn₂: Varulite

• Mn => Fe: Ferroalluaudite (Series)

• Fe₂ => FeAl: Wyllieite

• Color: Yellowish brown-Grayish green
• Streak: Yellowish brown
• Diaphaneity: Translucent

• Cleavage: Good on {100}, {010}, {110} (4 planes)
• Hardness: 5.5-6
• Density: 3.5

• System: Monoclinic
• Group: 2/m, C2/c
• Lattice: a=11.0, b=12.5, c=6.4, β=97.6