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
paralomonosovite:
Na5+xTi4(Si2O7)2[PO3(OH)]2-y[PO2(OH)2]yO2[(OH,F)2-xOz],
[x between 0 and 2, y between 0 and 1, z between 0 and 1]
The murmanite group is a member of the seidozerite supergroup
Back to Minerals