Prossima pubblicazione.
Referenza:
▪ Hatert, F., Philippo, S., Ottolini, L., Dal Bo, F., Scholz, R., Chaves, M.L.S.C., Yang, H., Downs, R.T., Menezes Filho, L.A.D. (2017): Wilancookite, (Ba,K,Na)8(Ba,Li,[])6Be24P24O96·32H2O, a new beryllophosphate with a zeolite framework. European Journal of Mineralogy, 29, (in press).
Abstract:
Wilancookite, ideally (Ba,K,Na)8(Ba,Li,[])6Be24P24O96·32H2O, is a new mineral species from the Lavra Ponte do PiauMí complex granitic pegmatite, Minas Gerais, Brazil. It occurs as tiny dodecahedral {1 1 0} crystals, deposited on moraesite fibres. Associated primary minerals are albite, montebrasite, Li-bearing micas, cassiterite, elbaite and quartz, while the secondary phosphate association contains fluorapatite, childrenite, eosphorite, zanazziite, greifenstenite, guimarãesite, ushkovite, saléeite and moraesite. The mineral is transparent and colourless, with a vitreous lustre; it is non-fluorescent, brittle, and its streak is white. The estimated Mohs hardness is 4–5, and the calculated density is 3.05 g/cm3,/sup>.Wilancookite is isotropic, colourless, non-pleochroic, with n = 1.560(2) (measured under λ = 590nm). Electron- and ion-microprobe analyses give (in wt%): P2O5 36.19, SiO2 0.04, Al2O3 0.41, BaO 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 on the basis of 96 anhydrous oxygen atoms, is (Ba7.54K0.32Na0.14)Σ8.00(Ba3.04Li1.57[]1.39)Σ6.00Be24.08(P23.88Al0.38Si0.03)Σ24.29O96·32H2O. The single-crystal unit-cell parameters are a = 13.5398(2)Å and V = 2482.21(7), space group I23. The eight strongest lines in the powder X-ray diffraction pattern [d(in Å)(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) (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 has been refined, based on single-crystal X-ray diffraction data, to R1 = 4.58%; the beryllophosphate framework is similar to that occurring in pahasapaite, and is based on zeolite-RHO cages. The mineral species and name were approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA2015-034).
IMA 2015-034 = wilancookite
- Marco E. Ciriotti
- Messaggi: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
IMA 2015-034 = wilancookite
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
- Marco E. Ciriotti
- Messaggi: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
Re: IMA 2015-034 = wilancookite
Pubblicazione fatta.
Referenza:
▪ Hatert, F., Philippo, S., Ottolini, L., Dal Bo, F., Scholz, R., Chaves, M.L.S.C., Yang, H., Downs, R.T., Menezes Filho, L.A.D. (2017): Wilancookite, (Ba,K,Na)8(Ba,Li,[])6Be24P24O96·32H2O, a new beryllophosphate with a zeolite framework. European Journal of Mineralogy, 29, 923-930.
Abstract:
Wilancookite, ideally (Ba,K,Na)8(Ba,Li,[])6Be24P24O96·32H2O, is a new mineral species from the Lavra Ponte do PiauMí complex granitic pegmatite, Minas Gerais, Brazil. It occurs as tiny dodecahedral {1 1 0} crystals, deposited on moraesite fibres. Associated primary minerals are albite, montebrasite, Li-bearing micas, cassiterite, elbaite and quartz, while the secondary phosphate association contains fluorapatite, childrenite, eosphorite, zanazziite, greifenstenite, guimarãesite, ushkovite, saléeite and moraesite. The mineral is transparent and colourless, with a vitreous lustre; it is non-fluorescent, brittle, and its streak is white. The estimated Mohs hardness is 4–5, and the calculated density is 3.05 g/cm3,/sup>.Wilancookite is isotropic, colourless, non-pleochroic, with n = 1.560(2) (measured under λ = 590nm). Electron- and ion-microprobe analyses give (in wt%): P2O5 36.19, SiO2 0.04, Al2O3 0.41, BaO 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 on the basis of 96 anhydrous oxygen atoms, is (Ba7.54K0.32Na0.14)Σ8.00(Ba3.04Li1.57[]1.39)Σ6.00Be24.08(P23.88Al0.38Si0.03)Σ24.29O96·32H2O. The single-crystal unit-cell parameters are a = 13.5398(2)Å and V = 2482.21(7), space group I23. The eight strongest lines in the powder X-ray diffraction pattern [d(in Å)(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) (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 has been refined, based on single-crystal X-ray diffraction data, to R1 = 4.58%; the beryllophosphate framework is similar to that occurring in pahasapaite, and is based on zeolite-RHO cages. The mineral species and name were approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA2015-034).
Referenza:
▪ Hatert, F., Philippo, S., Ottolini, L., Dal Bo, F., Scholz, R., Chaves, M.L.S.C., Yang, H., Downs, R.T., Menezes Filho, L.A.D. (2017): Wilancookite, (Ba,K,Na)8(Ba,Li,[])6Be24P24O96·32H2O, a new beryllophosphate with a zeolite framework. European Journal of Mineralogy, 29, 923-930.
Abstract:
Wilancookite, ideally (Ba,K,Na)8(Ba,Li,[])6Be24P24O96·32H2O, is a new mineral species from the Lavra Ponte do PiauMí complex granitic pegmatite, Minas Gerais, Brazil. It occurs as tiny dodecahedral {1 1 0} crystals, deposited on moraesite fibres. Associated primary minerals are albite, montebrasite, Li-bearing micas, cassiterite, elbaite and quartz, while the secondary phosphate association contains fluorapatite, childrenite, eosphorite, zanazziite, greifenstenite, guimarãesite, ushkovite, saléeite and moraesite. The mineral is transparent and colourless, with a vitreous lustre; it is non-fluorescent, brittle, and its streak is white. The estimated Mohs hardness is 4–5, and the calculated density is 3.05 g/cm3,/sup>.Wilancookite is isotropic, colourless, non-pleochroic, with n = 1.560(2) (measured under λ = 590nm). Electron- and ion-microprobe analyses give (in wt%): P2O5 36.19, SiO2 0.04, Al2O3 0.41, BaO 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 on the basis of 96 anhydrous oxygen atoms, is (Ba7.54K0.32Na0.14)Σ8.00(Ba3.04Li1.57[]1.39)Σ6.00Be24.08(P23.88Al0.38Si0.03)Σ24.29O96·32H2O. The single-crystal unit-cell parameters are a = 13.5398(2)Å and V = 2482.21(7), space group I23. The eight strongest lines in the powder X-ray diffraction pattern [d(in Å)(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) (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 has been refined, based on single-crystal X-ray diffraction data, to R1 = 4.58%; the beryllophosphate framework is similar to that occurring in pahasapaite, and is based on zeolite-RHO cages. The mineral species and name were approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA2015-034).
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
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