The jahnsite subgroup includes:
jahnsite-(CaMnFe):
CaMn2+Fe2+2Fe3+2(PO4)4(OH)2.8H2O
jahnsite-(CaMnMg):
CaMn2+Mg2Fe3+2(PO4)4(OH)2.8H2O
jahnsite-(CaMnMn):
CaMn2+Mn2+2Fe3+2(PO4)4(OH)2.8H2O
jahnsite-(CaMnZn):
CaMn2+Zn2Fe3+2(PO4)sub>4(OH)2.8H2O
jahnsite-(MnMnFe):
Mn2+Mn2+Fe2+2Fe3+2(PO4)4(OH)2.8H2O
jahnsite-(MnMnMg):
Mn2+MnMg2Fe3+2(PO4)4(OH)2.8H2O
jahnsite-(MnMnZn):
Mn2+Mn2+Xn2Fe3+2(PO4)4(OH)2.8H2O
jahnsite-(NaFeMg):
NaFe3+Mg2Fe3+2(PO4)4(OH)2.8H2O
jahnsite-(NaMnMg):
(Na,Ca)Mn2+(Mg,Fe3+)2Fe3+2(PO4)4(OH)2.8H2O
jahnsite-(NaMnMn):
NaMn2+(Mn2+Fe3+)Σ2Fe3+2(PO4)4(OH)2.8H2O
The jahnsite subgroup is a member of the jahnsite group
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