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Chromate
[Cr
6+
O
4
]
2-
Hydrate-Hydroxide-Oxide-Chromate
[A(3+)24][(OH)6|O25|(CrO4)8],3H2O [Monoclinic C2/m]
Dukeite
Hydroxide-Chromate-Phosphate
[A(2+)2][B(2+)][OH|CrO4|PO4] [Monoclinic P21/n]
Vauquelinite