Formula: Na2 K (Y.77 Dy.09 Gd.04 Er.04 Ho.02 Sm.02 Nd.01 Tb.01) Si6 O15
Name: Moskvinite-(Y)
Unit cell: 10.623 14.97 8.553 90.0 90.0 90.0 , V=1360.15
Space group: IBMM (74)

Sokolova E V , Hawthorne F C , Agakhanov A A , Pautov L A , The Canadian Mineralogist , 41 (2003) p.513-520, The crystal structure of moskvinite-(Y), Na2K(Y,REE)[Si6O15], a new silicate, mineral with [Si6O15] three-membered double-rings from the Dara-I-Pioz Moraine,, Tien-Shan mountains, Tajikistan, Locality: Dara-I-Pioz Moraine, Tien-Shan mountains, Tajikistan