...Sergey V. KRIVOVICHEV; Anton R. CHAKHMOURADIAN; Roger H. MITCHELL; Stanislav K. FILATOV; Nikita V. CHUKANOV Abstract The crystal structure of isolueshite, a recently described member of the perovskite group from the Khibina complex (Russia), was refined by single-crystal methods in the space group...

...). The crystal structure was solved using single-crystal X-ray diffraction data and refined to R 1 ( F ) = 2.61%. Heamanite-(Ce) has the aristotypic perovskite structure and adopts the same structure as isolueshite and tausonite. The six strongest diffraction lines are [ d obs in angstroms ( I in percentages...

...: a = 3.9876(1) Å, V = 63.404(6) Å 3 , Z = 1, resulting in a calculated density of 5.32(3) g/cm 3 . Goldschmidtite is the K-analog of isolueshite, (Na,La)NbO 3 . Raman spectra of goldschmidtite exhibit many second-order broad bands at 100 to 700 cm –1 as well as a pronounced peak at 815 cm –1 , which...

..., loparite, lueshite, isolueshite, lakargiite, megawite); (3) oxide single perovskites of the macedonite subgroup which exhibit second order Jahn-Teller distortions (macedonite, barioperovskite); (4) fluoride single perovskites of the neighborite subgroup (neighborite, parascandolaite); (5) chloride single...

... structure was solved ( R 1 = 0.0285, wR 2 = 0.0636 for 309 observed reflections). Pauloabibite is isostructural with ilmenite and is polymorphic with isolueshite (cubic) and lueshite (orthorhombic). The name is in honor of Paulo Abib Andery (1922–1976). Pauloabibite is trigonal, isostructural...

... the apatite ores and associated alkaline rocks, and the complexity of geological processes that had created this mineralogist’s paradise. Of some 450 mineral species described from Khibiny to date, about one-half are known to occur at Kukisvumchorr, including seven species [bussenite, isolueshite, kalifersite...

... synthetic single and double perovskites (e.g., Jirak et al. 1990 ; Dachraoui et al. 2012 ). In nature, this Si-Cr-bearing cubic perovskite is the first example of such a vacancy-bearing structure. A similar (yet different) quadruple splitting of the oxygen position was described in isolueshite, cubic...

... 1839 ), loparite (Na,REE,Ca) 2 Ti 2 O 6 ( Kuznetsov 1925 ), lueshite NaNbO 3 ( Safiannikoff 1959 ), latrappite (Ca,Na)(Nb,Fe 3+ ,Ti)O 3 ( Nickel 1964 ), macedonite PbTiO 3 ( Radusinović and Markov 1971 ), tausonite SrTiO 3 ( Vorob’ev et al. 1984 ), isolueshite (Na,REE)(Nb,Ti)O 3 ( Chakhmouradian...

... . Doklady AN SSSR, Earth Sci. Sect. , 248 , 127 – 130 . Krivovichev , S.V. , Chakhmouradian , A.R. , Mitchell , R.H. , Chukanov , N.V. , Filatov , S.K. ( 2000 ): Crystal structure of isolueshite, (Na, La)(Nb, Ti)O 3 , and its synthetic analogue . Eur. J. Mineral. , 12 , 597...