The vivianite group includes:
annabergite:
Ni3(AsO4)2.8H2O
babánekite:
Cu3(AsO4)2.8Hsub>2O
barićite:
(Mg,Fe)3(PO4)2.8H2O
erythrite:
Co3(AsO4)2.8H2O
hörnesite:
Mg3(AsO4)2.8H2O
köttigite:
Zn3(AsO4)2.8H2O
manganohörnesite:
Mn2+3(AsO4)2.8H2O
monteneroite:
Cu2+Mn2+2(AsO4)2.8H2O
parasymplesite:
Fe2+3(AsO4)2.8H2O
vivianite:
Fe2+3(PO4)2.8H2O
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