The eckermannite root name group includes:
eckermannite:
NaNa2(Mg4Al)Si8O22(OH)2
mangani-eckermannite:
NaNa2(Mg4Mn3+)Si8O22(OH)2
mangano-ferri-eckermannite:
NaNa2(Mn2+4Fe3+)Si8O22(OH)2
The eckermannite root name group is a member of the
sodium amphibole subgroup,
amphibole supergroup
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