pyrochlore


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Related to pyrochlore: columbite

pyrochlore

[′pī·rə‚klȯr]
(mineralogy)
(Na,Ca)2(Nb,Ta)2O6(OH,F) Pale-yellow, reddish, brown, or black mineral, crystallizing in the isometric system, and occurring in pegmatites derived from alkalic igneous rocks. Also known as pyrrhite.
References in periodicals archive ?
This is why pyrochlores are considered as candidates to encapsulate nuclear waste.
The problem of the synthesis consists in avoiding the formation of the undesired pyrochlore phases--[Pb.
Summary of the activity per unit mass measured for the different radionuclides that constitute the smaller measured NORM samples Sample Radionuclide Activity (Bq/kg) Uncertainty (%) Allanite K-40 1397 35 Ra-226 1155 35 Th-232 17855 30 U-238 2178 35 Monozite Ra-226 24740 25 Th-232 170903 25 Pyrochlore Ra-226 1836 40 Th-232 35303 30 U-238 7833 35 Zircon Ra-226 232 40 Th-232 14 45 U-238 219 40 ISG Pye Ra-226 67 26 Th-232 54 42 K-40 151 48 DAP Ra-226 15 29 Th-232 10 34 U-238 1923 35 K-40 6 30 CEMEX Ra-226 57 28 type FC Th-232 39 27 U-238 139 48 K-40 60 30 Monocalcium Ra-226 16 23 phosphate (biofos) Th-232 11 43 U-238 1970 31 K-40 6 29 Australian Ra-226 1963 37 zircon sand Th-232 442 33 U-238 3179 39
The Virgil carbonatite includes syenite and biotite sovite that includes calcite, biotite and minor feldspar, apatite, zircon, columbite and pyrochlore.
These properties are generally valid for materials with the same topology, that is for magnetic moments on the pyrochlore lattice.
2002), or even (in the case of the granite-derived Ormiston sediments) fresh grains of accessory Nb-minerals such as pyrochlore or columbitetantalite.
Other accessory minerals identified in the groundmass are albite, anatase, apatite group, calcite, magnetite, marcasite, perovskite, pyrite, pyrochlore, quartz, weloganite and zircon (Jambor et al.
A Quebec mining company intends to extract industrial minerals from its recently-acquired pyrochlore property on the James Bay lowlands.
The Panel therefore recommends, among other things, that the UN Security Council immediately declare a temporary embargo on the import or export of coltan, niobium, pyrochlore, cassiterite, timber, gold and diamonds from or to Uganda, Rwanda and Burundi until those countries involvement in the looting of Congo's resources is made clear and declared so by the Security Council.
The pegmatitic carbonatites consist of calcite, magnetite, apatite, aegirine-augite, biotite, phiogopite, and pyrochlore.
Its flotation collectors, marketed under the Atrac, Lilaflot, Armoflote, Armeen and Ethomeen brand names, are mainly used for the flotation of non-sulphide minerals such as apatite, barite, calcite, dolomite, feldspar, fluorspar, kyanite, magnesite, potash, pyrochlore, quartz, scheelite, wollastonite and zinc oxides.