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Mineralogical ClassificationBiraite-(Ce) (IMA 2003-047)
26th Oct 2005 18:28 UTCJim Ferraiolo
Biraite-(Ce), Ce2Fe2+(CO3)(Si2O7), a new mineral from Siberia with a novel structure type. A. Konev, M. Pasero, D. Puscharovsky, S., Merlino, A. Kashaev, L. Suvorova, Z. Ushchapovskaya, N. Nartova, Y. Lebedeva & N. Chukanov, European Journal of Mineralogy, 17(5), 2005, pp 715–721.
abstract:
Biraite-(Ce) occurs in the Biraia carbonatite dyke, Irkutsk district, Russia, associated with cordylite-(Ce) and -(La), aragonite, strontianite, Sr,Fe-bearing dolomite, ancylite-(Ce) and -(La), hydroxyl-bastnäsite-(Ce), daqingshanite-(Ce) and a host of other minerals. It occurs as irregular to well-shaped grains from 0.1 to 3 mm in length, and is brown with a vitreous lustre; H.5, Dcalc 4.76 g/cm3; a 1.785, b 1.810, g 1.820, 2Va 66°; dispersion r < v, weak. TG, DTA and DTG curves are presented. A combination of EPMA and wet chemical analyses led to the simplified formula Ce2Fe2+(CO3)(Si2O7); the IR spectrum confirmed the presence of CO3 groups. Indexed XRD powder data are tabulated; strongest lines 2.92(10), 3.30(5), 2.65(5), 2.23(5), 4.41(4), 3.61(4),3.14(4) Å; a 6.505, b 6.744, c 18.561 Å, b 108.75°, V 771.1 Å3, Z = 4, space group P21/c. The crystal structure was refined to R 0.033; it is a new structure type based on polyhedral (001) sheets composed of pairs of edge-sharing octahedra, groups and triangles. Ce3+ cations in ten-fold coordination provide the linkage between neighbouring polyhedral sheets.
27th Oct 2005 15:32 UTCPeter Haas
27th Oct 2005 15:34 UTCMarco E. Ciriotti
27th Oct 2005 15:43 UTCPeter Haas
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