| Reference Type | Journal (article/letter/editorial) |
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| Title | Cesiokenopyrochlore, the First Natural Niobate with an Inverse Pyrochlore Structure |
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| Journal | The Canadian Mineralogist | ISSN | 1499-1276 |
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| Authors | Agakhanov, Atali A. | Author |
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| Kasatkin, Anatoly V. | Author |
| Britvin, Sergey N. | Author |
| Siidra, Oleg I. | Author |
| Pautov, Leonid A. | Author |
| Pekov, Igor V. | Author |
| Karpenko, Vladimir Yu. | Author |
| Year | 2021 (February 26) | Volume | 59 |
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| Page(s) | 149-157 | Issue | 1 |
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| Publisher | Mineralogical Association of Canada |
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| URL | |
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| DOI | doi:10.3749/canmin.2000056Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 17061509 | Long-form Identifier | mindat:1:5:17061509:1 |
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| GUID | f1fa6c4d-22c8-4898-b784-0fa24cc845d5 |
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| Full Reference | Agakhanov, Atali A., Kasatkin, Anatoly V., Britvin, Sergey N., Siidra, Oleg I., Pautov, Leonid A., Pekov, Igor V., Karpenko, Vladimir Yu. (2021) Cesiokenopyrochlore, the First Natural Niobate with an Inverse Pyrochlore Structure. The Canadian Mineralogist, 59 (1) 149-157 doi:10.3749/canmin.2000056 |
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| Plain Text | Agakhanov, Atali A., Kasatkin, Anatoly V., Britvin, Sergey N., Siidra, Oleg I., Pautov, Leonid A., Pekov, Igor V., Karpenko, Vladimir Yu. (2021) Cesiokenopyrochlore, the First Natural Niobate with an Inverse Pyrochlore Structure. The Canadian Mineralogist, 59 (1) 149-157 doi:10.3749/canmin.2000056 |
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| In | (2021, January) The Canadian Mineralogist Vol. 59 (1) Mineralogical Association of Canada |
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| Abstract/Notes | Cesiokenopyrochlore is a new mineral belonging to the pyrochlore group. It was discovered in a specimen of granitic pegmatite collected at Tetezantsio, Betafo region, Madagascar. The mineral forms rough equant crystals up to 0.05 mm in size intergrown with béhierite and rynersonite. Cesiokenopyrochlore is light-brown, translucent, with resinous luster. Dcalc. = 5.984 g/cm3. In reflected light it is light gray, isotropic, with strong light-brown internal reflections. The crystal structure was refined to R1 = 0.0212. The mineral is cubic, , a = 10.444(1) Å, V = 1139.5(2) Å3, and Z = 8. The strongest lines of the powder X-ray diffraction pattern [d, Å, (I, %) (hkl)] are: 6.03 (37) (111), 3.70 (9) (220), 3.15 (100) (311), 3.02 (36) (222), 2.012 (17) (511, 333), 1.848 (19) (440), 1.576 (11) (622). The chemical composition is (wt.%; electron microprobe): Cs2O 22.66, Na2O 1.74, CaO 0.64, Nb2O5 20.87, Ta2O5 21.27, WO3 30.67, H2O (calc) 0.12, total 97.97. The empirical formula of the holotype specimen calculated on the basis of (Nb+Ta+W) = 2 apfu and (O+OH) = 6 apfu and written according to the pyrochlore-supergroup nomenclature is Na0.29Ca0.06(Nb0.81W0.69Ta0.50)Σ2[O5.93(OH)0.07]Σ6Cs0.83. The simplified formula of the holotype specimen is □2(Nb,W,Ta)Σ2O6Cs. Cesiokenopyrochlore is the first natural niobate to adopt the inverse pyrochlore structure. |
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