AM_Chivruaiite Formula: Ca.775 Sr.05 Mn.1 K.05 Ba.025 Ti1.03 Nb.22 Si3 O12.73 H14.986 Name: Chivruaiite Unit cell: 7.1918 23.166 6.9472 90.0 90.0 90.0 , V=1157.44 Space group: CMMM (65)

Men shikov Y P , Krivovichev S V , Pakhomovsky Y A , Yakovenchuk V N , Ivanyuk G Yu , Mikhailova J A , Armbruster T , Selivanova E A , American Mineralogist , 91 (2006) p.922-928, Chivruaiite, Ca4(Ti,Nb)5[(Si6O17)2|(OH,O)5]·13-14H2O, a new mineral, from hydrothermal veins of Khibiny and Lovozero alkaline massifs, Locality: Chivruai River valley, Kola peninsula, Russia