The fairfieldite group includes:
anorthoroselite:
Ca2Co(AsO4)2.2H2O
cassidyite:
Ca2Ni(PO4)2.2H2O
collinsite:
Ca2Mg(PO4)2.2H2O
fairfieldite:
Ca2Mn2+(PO4)2.2H2O
gaitite:
Ca2Zn(AsO4)2.2H2O
hillite:
Ca2Zn(PO4)2.2H2O
messelite:
Ca2Fe2+(PO4)2.2H2O
parabrandtite:
Ca2Mn2+(AsO4)2.2H2O
talmessite:
Ca2Mg(AsO4)2.2H2O
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