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- W2080846572 abstract "Summary A hydrated barium-strontium pyrochlore with only subordinate amounts of Ca and Na has been found in a weathered biotite rock (contact-rock of a carbonatite) from Panda Hill, Tanganyika, as small euhedral yellowish-grey cubic crystals (showing the combination of the octahedron and the cube) in a rock containing euhedral biotite, some orthoclase, and several other minerals. Hydrated Ba-Sr pyrochlore is isotropic, the refractive index varies from 2·07 to 2·10. The reflectivity (vertical illumination) is 13·2 %. H. Poor {111} cleavage. The pyrochlore structure (space-group O 7 h –Fd3m) and the unit-cell dimensions ( a 10·562 Å.) are derived from X-ray powder and Weissenberg photographs. The calculated specific gravity is 4·01 (observed, 4·00 on dried material). Chemical analysis gives BaO 12·5, SrO 6·4, Na 2 O 0·28, K 2 O 0·25, CaO 1·35, rare earths (mainly Ce 2 O 3 ) 2, ThO 2 0·6, FeO 0·45, TiO 2 3·9, Nb 2 O 5 67·0, Ta 2 O 5 0·22, H 2 O+ 4·0, other constituents 2·21, total 101·16. After deduction for impurities the following formula resulted: (Ba 0·30 Sr 0·22 Ca 0·05 Ce 0·04 Na 0·03 Fe 0·02 K 0·01 Th 0·01 )(Nb 1·83 Ta 0·004 Ti 0·17 )O 5·61 (H 2 O) 0·80 . The ideal formula for pyrochlore is A 2 B 2 O 6 (F,OH). In the mineral described only a third of the A -positions are occupied by Ba, Sr, etc. Infra-red spectrophotometry does not indicate hydroxyl-groups. When the mineral is treated with TINO 3 solution the intensities of the X-ray diffraction lines 333/511, and 444 are changed; hydrated Ba-Sr pyrochlore shows a certain exchange-capacity. The name pandaite , from Panda Hill, is proposed for the new mineral." @default.
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- W2080846572 date "1959-03-01" @default.
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- W2080846572 title "A hydrated barium-strontium pyrochlore in a biotite rock from Panda Hill, Tanganyika" @default.
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- W2080846572 doi "https://doi.org/10.1180/minmag.1959.032.244.03" @default.
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