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- W2023305220 abstract "Abstract Loparite-(Ce) is a ubiquitous accessory mineral in modally diverse albite-rich metasomatic rocks of the Burpala alkaline complex, Siberia. Compositionally, the mineral approaches the ideal formula Na REE Ti 2 O 6 ( REE = Ce > La > Nd > Pr > Sm), and contains minor CaTiO 3 (<4.8 mol.%), SrTiO 3 (<4.7 mol.%) and NaNbO 3 (<6.4 mol.%), The mineral is pseudocubic [ a p = 3.8815(3) Å], and produces an XRD pattern similar to that of synthetic NaCeTi 2 O 6 [ Pnma , a = 5.4517(4), b = 7.7058(9), c = 5.4333(6) Å]. The atomic coordinates and isotropic thermal parameters of synthetic NaCeTi 2 O 6 refined from an XRD powder pattern using the Rietveld method, are given. At Burpala, loparite precipitated from an alkaline REE -rich fluid during the metasomatic alteration of earlier-formed intrusive rocks. In some parageneses, loparite was replaced by ‘metaloparite’ during the final stages of metasomatism. ‘Metaloparite’ has the empirical formula REE Ti 2 O 6- x (OH,F) x ·nH 2 O, and shows minor enrichment in Ca and depletion in Sr, compared to co-existing loparite. The formation of ‘metaloparite’ involved cation leaching, hydration and ion-exchange between loparite and a fluid. ‘Metaloparite’ is metamict at room temperature, but some samples regain the perovskite-type structure upon heating." @default.
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- W2023305220 date "1999-08-01" @default.
- W2023305220 modified "2023-10-14" @default.
- W2023305220 title "Loparite and ‘metaloparite’ from the Burpala alkaline complex, Baikal Alkaline Province (Russia)" @default.
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- W2023305220 doi "https://doi.org/10.1180/002646199548691" @default.
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