The hornblende root name group includes:
ferro-hornblende:
☐Ca2(Fe2+4Al)(Si7Al)O22(OH)2
magnesio-ferri-hornblende:
Ca2(Mg4Fe3+)[(Si7Al)O22](OH)2
magnesio-hornblende:
☐Ca2(Mg4Al)(Si7Al)O22(OH)2
The hornblende root name group is a member of the
calcium amphibole subgroup,
amphibole supergroup
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