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Zubkova N. V. Chukanov N. V. Pekov I. V. Pushcharovskii D. Yu. 《Doklady Earth Sciences》2011,439(1):998-1001
Doklady Earth Sciences - 相似文献
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D. A. Ksenofontov Yu. K. Kabalov I. V. Pekov N. V. Zubkova I. A. Ekimenkova D. Yu. Pushcharovskii 《Doklady Earth Sciences》2014,456(1):520-523
The crystal structure of fornacite Pb2(Cu,Fe)[CrO4(As,P)O4OH] from the Berezovskii deposit (Central Urals, Russia) was refined by X-ray powder diffraction data using the Rietveld method. Fornacite is monoclinic, space group P21/c, the unit cell dimensions are a = 8.09015(12), b = 5.90913(9), c = 17.4839(2) Å, β = 109.99(2), V = 785.5(3) Å3, and Z = 4. The structure was refined in the isotropic approximation of the atomic displacement parameters up to R p = 0.0516, R wp = 0.0692, R B = 0.0229, and R F = 0.0200. The fornacite structure is similar to that of minerals of the brackebuschite-group and consists of heteropolyhedral chains, built by the columns of edge-sharing Cu2+O6 octahedra connected with isolated Cr6+O4 and As5+O4 tetrahedra. The chains are linked by ninefold Pb2+ polyhedra. 相似文献
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I. V. Pekov N. V. Zubkova D. Yu. Chernyshov M. E. Zelenski V. O. Yapaskurt D. Yu. Pushcharovskii 《Doklady Earth Sciences》2013,448(1):112-116
A new Cu-rich variety of lyonsite has been found from fumarolic sublimates of the Tolbachik volcano (Kamchatka, Russia). The empirical formula is Cu4.33Fe 2.37 3+ Ti0.26Al0.26Zn0.07(V5.85As0.07Mo0.07P0.01S0.01)O24. The crystal structure was studied on single crystal using synchrotron radiation, R = 0.0514. The mineral is orthorhombic, Pnma, a = 5.1736(7), b =10.8929(12), c = 18.220(2) Å, V = 1026.8(2) Å3, and Z = 2. The structural formula is (Cu0.6Ti0.3Al0.3Fe 0.2 3+ □0.6)Σ2Cu2(Fe 2.2 3+ Cu1.8)Σ4(V5.8As0.1Mo0.1)Σ6O24. It is proposed to recast the simplified formula of lyonsite as Cu3+x (Fe 4?2x 3+ Cu2x )(VO4)6, where 0 ≤ x ≤ 1. 相似文献
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