Selsurt) loparite with average composition ([Na.sub.0.45] [LREE.sub.0.35] [Ca.sub.0.14] [Sr.sub.0.04] [Fe.sub.0.005] [Th.sub.0.004])([Ti.sub.0.90] [Nb.sub.0.10] [Ta.sub.0.008])[O.sub.3] and average molecular weight of 172, classified as calcian niobian loparite-(Ce), is actually a solid solution of loparite ([Na.sub.0.5] [LREE.sub.0.5] Ti[O.sub.3]) with perovskite (CaTi[O.sub.3]) and tausonite
(SrTi[O.sub.3]) in the thorium-substituted A-site and with lueshite (NaNb[O.sub.3]) in the tantalum-substituted B-site.
Associated minerals in blue jade are: jadeite, titanian omphacite, sodic amphibole, titanite, rutile, anatase, strontium-apatite and tausonite
. In lavender jade, associated minerals are: jadeite, titanian jadeite, rutile, titanite, zircon, natrolite, lamprophyllite, tausonite
and an undetermined Sr-Ti silicate.