The hureaulite group includes:
hureaulite:
Mn2+5(PO3OH)2(PO4)2.4H2O
miguelromeroite
Mn2+5(AsO3OH)2(AsO4)2(H2O)4
sainfeldite:
Ca5(AsO4)2(AsO3OH)2.4H2O
villyaellenite:
(Mn,Ca)Mn2Ca2(AsO3OH)2(AsO4)2.4H2O
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