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 ?
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
Pyrochlore is the primary mineral from which niobium is obtained.
The German ambassador in Kigali [the capital of Rwanda]," the report says, "told the Panel about German support for German business dealing in [the minerals] pyrochlore and coltan in occupied Congo [areas under rebel and Ugandan-Rwandan-Burundian control].
The pegmatitic carbonatites consist of calcite, magnetite, apatite, aegirine-augite, biotite, phiogopite, and pyrochlore.
Niobium Tin Pyrochlore (NTP) Yellow is an innovative inorganic pigment that expands the envelope of durable color, according to the company.
Included here are also nine papers from the focused session on materials technology for nuclear waste treatment and disposal; among them are new actinidex waste forms with pyrochlore and garnet structures, and using the vitrification test rig for process improvements on the waste vitrification plants.
The study of perovskite and pyrochlore oxide materials is also an important area, due to properties such as magnetorestriction (70), charge disproportionation (71), and ionic conductivity (72).
03Zr2O7 Pyrochlore Powder for Advanced Energy Application Yan Chen, Nina Orlovskaya, Nicholas Miller, Harry Abernathy, Daniel Haynes, David Tucker, Randall Gemmen
The pyrochlore concentrate produced at Niobec is transformed into ferroniobium grading 66% niobium using an aluminothermic converter.
Results to date confirm presence of minor pyrochlore (Nb) and REE carbonate, previously identified in several mineralogical studies.