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Hureaulite group
[ A
2+
3
][ B
2+
2
][(H X O
4
)
2
][( X O
4
)
2
],4H
2
O
[ Mn ][ Mn ][ P ]:
Hureaulite
[ Mn ][ Mn ][ As ]:
Miguelromeroite
[ Cd ][ Zn ][ As ]: Nyholmite
[ Ca ][ Ca ][ As ]: Sainfeldite
[ Mn ][ Ca ][ As ]:
Villyaellenite
System: Monoclinic