| Reference Type | Journal (article/letter/editorial) |
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| Title | Loparite and ‘metaloparite’ from the Burpala alkaline complex, Baikal Alkaline
Province (Russia) |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Chakhmouradian, A. R. | Author |
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| Mitchell, R. H. | Author |
| Pankov, A. V. | Author |
| Chukanov, N. V. | Author |
| Year | 1999 (August) | Volume | 63 |
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| Issue | 4 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_63/63-4-519.pdf+ |
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| DOI | doi:10.1180/002646199548691Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1303 | Long-form Identifier | mindat:1:5:1303:5 |
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| GUID | 0 |
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| Full Reference | Chakhmouradian, A. R., Mitchell, R. H., Pankov, A. V., Chukanov, N. V. (1999) Loparite and ‘metaloparite’ from the Burpala alkaline complex, Baikal Alkaline
Province (Russia) Mineralogical Magazine, 63 (4) 519-534 doi:10.1180/002646199548691 |
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| Plain Text | Chakhmouradian, A. R., Mitchell, R. H., Pankov, A. V., Chukanov, N. V. (1999) Loparite and ‘metaloparite’ from the Burpala alkaline complex, Baikal Alkaline
Province (Russia) Mineralogical Magazine, 63 (4) 519-534 doi:10.1180/002646199548691 |
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| Abstract/Notes | AbstractLoparite-(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 NaREETi2O6 (REE = Ce > La > Nd > Pr > Sm), and contains minor CaTiO3 (<4.8 mol.%), SrTiO3 (<4.7 mol.%) and NaNbO3 (<6.4 mol.%), The mineral is pseudocubic [ap = 3.8815(3) Å], and produces an XRD pattern similar to that of synthetic NaCeTi2O6 [Pnma, a = 5.4517(4), b = 7.7058(9), c = 5.4333(6) Å]. The atomic coordinates and isotropic thermal parameters of synthetic NaCeTi2O6 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 REETi2O6-x(OH,F)x·nH2O, 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. |
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