Wilancookite, (Ba,K,Na)8(Ba,Li,[])6Be24P24O96·32H2O, a new 2 beryllophosphate with a zeolite framework.

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dc.contributor.authorHatert, Frédéric
dc.contributor.authorPhilippo, Simon
dc.contributor.authorOttolini, Luisa
dc.contributor.authorBol, Fabrice Dal
dc.contributor.authorCipriano, Ricardo Augusto Scholz
dc.contributor.authorChaves, Mario Luiz de Sá Carneiro
dc.contributor.authorYang, Hexiong
dc.contributor.authorDowns, Robert T.
dc.contributor.authorMenezes Filho, Luiz Alberto Dias
dc.date.accessioned2017-10-10T13:52:59Z
dc.date.available2017-10-10T13:52:59Z
dc.date.issued2017
dc.description.abstractWilancookite, ideally (Ba,K,Na)8(Ba,Li,[])6Be24P24O96·32H2O, is a new mineral species from the Lavra Ponte do Piauí 19 complex granitic pegmatite, Minas Gerais, Brazil. It occurs as tiny dodecahedral {1 1 0} crystals, deposited on moraesite fibres. 20 Associated primary minerals are albite, montebrasite, Li-bearing micas, cassiterite, elbaite and quartz, while the secondary phosphate 21 association contains fluorapatite, childrenite, eosphorite, zanazziite, greifenstenite, guimarãesite, ushkovite, saléeite and moraesite. 22 The mineral is transparent and colourless, with a vitreous lustre; it is non-fluorescent, brittle, and its streak is white. The estimated 23 Mohs hardness is 4–5, and the calculated density is 3.05 g/cm3.Wilancookite is isotropic, colourless, non-pleochroic, with n = 1.560(2) 24 (measured under l = 590nm). Electron- and ion-microprobe analyses give (in wt%): P2O5 36.19, SiO2 0.04, Al2O3 0.41, BaO 25 34.65, Na2O 0.09, K2O 0.32, BeO 12.86, Li2O 0.50, and H2Ocalc 12.31, total 97.37wt%. The resulting empirical formula, calculated 26 on the basis of 96 anhydrous oxygen atoms, is (Ba7.54K0.32Na0.14)S8.00(Ba3.04Li1.57[]1.39)S6.00Be24.08(P23.88Al0.38Si0.03)S24.29 27 O96·32H2O. The single-crystal unit-cell parameters are a = 13.5398(2)A and V = 2482.21(7), space group I23. The eight strongest 28 lines in the powder X-ray diffraction pattern [d(in A )(I)(hkl)] are: 6.90(60)(2 0 0), 5.54(80)(2 1 1), 3.630(60)(3 2 1, 3 1 2), 3.212(70) 29 (3 3 0, 4 1 1), 3.043(100)(4 2 0, 4 0 2), 2.885(70)(3 3 2), 2.774(80)(4 2 2), and 2.398(60)(4 4 0). The crystal structure of wilancookite 30 has been refined, based on single-crystal X-ray diffraction data, to R1 = 4.58%; the beryllophosphate framework is similar to that 31 occurring in pahasapaite, and is based on zeolite-RHO cages. The mineral species and name were approved by the Commission on 32 New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA2015-034).pt_BR
dc.identifier.citationHATERT, F. et al. Wilancookite, (Ba,K,Na)8(Ba,Li,[])6Be24P24O96·32H2O, a new 2 beryllophosphate with a zeolite framework. European Journal of Mineralogy, v. 29, n. 5, p. 923-930, 2017. Disponível em: <https://www.schweizerbart.de/papers/ejm/detail/29/88299/Wilancookite_Ba_K_Na_8_Ba_Li__6_Be24_P24_O96_32H?af=crossref>. Acesso em: 25 ago. 2017.pt_BR
dc.identifier.doihttps://dx.doi.org/10.1127/ejm/2017/0029-2661
dc.identifier.issn1617-4011
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/8914
dc.identifier.uri2https://www.schweizerbart.de/papers/ejm/detail/29/88299/Wilancookite_Ba_K_Na_8_Ba_Li__6_Be24_P24_O96_32H?af=crossrefpt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.subjectWilancookitept_BR
dc.subjectNew mineralpt_BR
dc.subjectZeolite frameworkpt_BR
dc.subjectBeryllophosphatept_BR
dc.titleWilancookite, (Ba,K,Na)8(Ba,Li,[])6Be24P24O96·32H2O, a new 2 beryllophosphate with a zeolite framework.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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