CATIONIC ORDERING IN THE STRUCTURE OF SARANOVSKITE, A NEW COMPLEX OXIDE OF THE CRICHTONITE GROUP

A new mineral saranovskite relating to the crichtonite-group, ideally SrCaFe2 2(Cr4Ti2)Ti1 O3 , has been discovered in the Major Sarans Chrome Deposit (Middle Urals, Russia). Its crystal structure was investigated on the base of single-crystal X-ray diffraction data and refined toR 0.024 (2144 independent reflections with F gt; 3σ).The new mineralis trigonal, with the unit-cell parameters a = 1 .3553(2) Å, c = 20.7301(4) Å, V = 1925.12 (8) Å3and space group R; Z = 3. Ordereddistributionofcationsoversixsiteswasestablished.

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