Metavivianite, Fe3(PO4)2·8H2O, is a new mineral occurring with kryzhanovskite in solution cavities in triphylite at the Big Chief pegmatite near Glendale, South Dakota. It is triclinic, with a = 7.81 Å, b = 9.08Å, c = 4.65 Å, α = 94.77°, β = 97.15°, γ = 107.37°, and is isostructural with symplesite, Fe3(AsO4)2·8H2O. Electron probe analysis indicates that it is a polymorph of vivianite. Vivianite and parasymplesite are therefore isostructural, monoclinic dimorphs of the isostructural and triclinic minerals metavivianite and symplesite.

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