| cassidyite | Ca2(Ni,Mg)(PO4)2·2H2O |
| collinsite | Ca2(Mg,Fe)(PO4)2·2H2O |
| fairfieldite | Ca2(Mn,Fe)(PO4)2·2H2O |
| gaitite | Ca2Zn(AsO4)2·2H2O |
| messelite | Ca2(Fe,Mn)(PO4)2·2H2O |
| parabrandtite | Ca2Mn(AsO4)2·2H2O |
| roselite-beta | Ca2Co(AsO4)2·2H2O |
| talmessite | Ca2Mg(AsO4)2·2H2O |