β-Lomonosovite : Na4(H,Na)6Ti4[O2|PO4|Si2O7]2, Lamprophyllite : (Sr,K,Ba)2(Na,Ti,Mn2+,Fe3+)4Ti2[O|(O,OH,F)|Si2O7]2, Aegirine : NaFe3+[Si2O6]
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