The murmanite group includes:
calciomurmanite:
(Na,☐)2Ca(Ti,Mg,Nb)4[Si2O7]2O2(OH,O)2(H2O)4
lomonosovite:
Na6Na2Ti2Na2Ti2(Si2O7)2(PO4)2O4
murmanite:
Na2Ti2Na2Ti2(Si2O7)2O4(H2O)4
The murmanite group is a member of the seidozerite supergroup
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