AM_Pyatenkoite-(Y) Formula: Na5 (Y.5 Dy.3 Gd.2) (Ti.8 Nb.2) Si6 O24 H12 Name: Pyatenkoite-(Y) Unit cell: 10.696 10.696 15.728 90.0 90.0 120.0 , V=1558.29 Space group: R32 (155)

Rastsvetaeva R K , Khomyakov A P , Doklady Chemistry , 351 (1996) p.283-286, Crystal structure of pyatenkoite-(Y) Na5YTiSi6O18*6H2O, a new mineral of the, hilairite group: crystal structure, Locality: Lovozero massif, Kola Peninsula, Russia