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Vivianite
Name
Vivianite
Chemical
Formula
Fe3(PO4)2?8(H2O)
Species
Phosphates
Crystal
System
Monoclinic
Mohs
Scale
1-2
Color
Colorless, very pale green, becoming dark blue, dark greenish blue, indigo-blue, then black with oxidation
Luster
Vitreous, Pearly, Dull