The halotrichite group includes:
apjohnite:
Mn2+Al2(SO4)4.22H2O
halotrichite:
Fe2+Al2(SO4)4.22H2O
pickeringite:
MgAl2(SO4)4.22H2O
redingtonite:
Fe2+Cr2(SO4)4.22H2O
wupatkiite:
CoAl2(SO4)4.22H2O
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