The hastingsite root name group includes:
hastingsite:
NaCa2(Fe2+4Fe3+)(Si6Al2)O22(OH)2
magnesio-hastingsite:
NaCa2(Mg4Fe3+)(Si6Al2)O22(OH)2
potassic-chloro-hastingsite:
KCa2(Fe2+4Fe3+)(Si6Al2)O22Cl2
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