| Reference Type | Journal (article/letter/editorial) |
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| Title | Pandaite from the Mrima Hill niobium deposit (Kenya) |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | Harris, P. M. | Author |
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| Year | 1965 (June) | Volume | 35 |
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| Issue | 270 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_35/35-270-277.pdf+ |
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| DOI | doi:10.1180/minmag.1965.035.270.03Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 5872 | Long-form Identifier | mindat:1:5:5872:2 |
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| GUID | 0 |
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| Full Reference | Harris, P. M. (1965) Pandaite from the Mrima Hill niobium deposit (Kenya) Mineralogical Magazine and Journal of the Mineralogical Society, 35 (270) 277-290 doi:10.1180/minmag.1965.035.270.03 |
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| Plain Text | Harris, P. M. (1965) Pandaite from the Mrima Hill niobium deposit (Kenya) Mineralogical Magazine and Journal of the Mineralogical Society, 35 (270) 277-290 doi:10.1180/minmag.1965.035.270.03 |
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| In | (1965) Mineralogical Magazine Vol. 35 (270) Mineralogical Society |
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| Abstract/Notes | SummaryA hydrated barium pyrochlore (pandaite) has been found at Mrima Hill (Kenya) in a residuum consisting mainly of goethite/limonite and gorceixite. The pandaite occurs as pale yellow or white octahedral crystals, which have a micro-crystalline interior. It is isotropic, the refractive index varies from 2·07 to 2·11. The calculated specific gravity is 4·07, and the unit cell dimension is 10·59 Å. After deduction of impurities the following formula was obtained (Na0·03 K0·02 Mg0·05 Ca0·09 Ba0·36 Ln0·05 Th0·01 Pb0·004) (Ti0·21 Nb1·78 Ta0·01) (H2O)1·64 O5·52.Comparison of the calculated formula, essentially A0·614B2 (H2O)1·64 O5·52 with the ideal pyrochlore formula A2B2O6F indicates important deficiencies in the structure. Differential thermal analysis shows a large endothermic peak at 340° C and moderate exothermic peaks at 480 and 780° C. In its physical, chemical, X-ray, and thermal properties the Mrima pandaite is similar to pandaites described from other localities.The nature of the alteration of primary pyrochlore to pandaite has been studied using an electron probe. |
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