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Metavivianite: (Fe++3-x,Fe+++x)(PO4)2(OH)x·8-x(H2O), x=0.5
Comments: Rust-brown, metavivianite var. kertschenite crystals to 1.5 cm in length.
Location: Kertsch Crimea, Ukraine.
Scale: 5.5 x 3.5 cm.
© John Veevaert