The melilite group includes:
åkermanite: Ca2MgSi2O7
alumoåkermanite: (Ca,Na)2(Al,Mg,Fe2+)(Si2O7)
bennesherite: Ba2Fe2+Si2O7
ferroåkermanite: Ca2Fe2+Si2O7
gehlenite: Ca2Al(SiAl)O7
hardystonite: Ca2ZnSi2O7
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