AM_Polyakovite-(Ce) Formula: (Ce1.84 La1.24 Nd.36 Pr.16 Y.04 Ca.24 Th.12) Mg.8 Fe.92 Ti1.52 Nb.32 Cr1.28 Si4 O22 Name: Polyakovite-(Ce) Unit cell: 13.398 5.6974 11.042 90.0 100.539 90.0 , V=828.66 Space group: C12/M1 (12)

Popov V A , Pautov L A , Sokolova E V , Hawthorne F C , McCammon C A , Bazhenova L F , The Canadian Mineralogist , 39 (2001) p.1095-1104, Polyakovite-(Ce), (REE,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22, a new metamict, mineral species from the Ilmen Mountains, Southern Urals, Russia: Mineral, discription and crystal chemistry, Locality: Ilmen Mountains, Southern Urals, Russia