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Metavivianite

Year of discovery: 1974 (Big Chief mine (Johnson pegmatite), USA), 1950 (Japan)

Locality list: 7 localities of metavivianite

• Fe₃(PO₄)₂(OH)₂,6H₂O
• Fe³⁺_3-xFe²⁺_x(PO₄)₂(OH)_x,(8-x)H₂O
• [Fe²⁺,Fe³⁺₂][(OH)₂|(PO₄)₂]^8-,6H₂O
• x=0.5-1.0

• Class: Phosphate - Hydroxide - Hydrate
• Formed by oxidation of Vivianite by Photo-oxidation.
• Paramorph: Replace Vivianite.

• Polymorph: Ferrostrunzite (Triclinic)

• Fe³⁺(OH) => Fe²⁺,H₂O: Vivianite

• Color: Dark blue, Dark green
• Streak: Blue, Bluish green
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Perfect on {110} (1 plane)
• Hardness: 1.5-2

• System: Triclinic
• Group: 1, P1
• Lattice: a=7.8, b=9.1, c=4.7, α=94.8, β=97.2, γ=107.4

Etymology: Meta- (with) in Greek and J. G. Vivian, British mineralogist