AM_Yakovenchukite-(Y) Formula: K2.76 Na Ca1.12 (Y1.66 Yb.34) Si12 O34 H8 Name: Yakovenchukite-(Y) Unit cell: 14.972 14.137 14.594 90.0 90.0 90.0 , V=3088.95 Space group: PCCA (54)

Krivovichev S V , Pakhomovsky Y A , Ivanyuk G Y , Mikhailova J A , Men shikov Y P , Armbruster T , Selivanova E A , Meisser N , American Mineralogist , 92 (2007) p.1525-1530, Yakovenchukite-(Y), K3NaCaY2(Si12O30)(H2O)4, a new mineral from the Khibiny, massif, Kola Peninsula, Russia: a novel type of octahedral-tetrahedral, open-framework structure, Locality: Khibiny massif, Kola Peninsula, Russia