Monazite, xenotime and cerianite are noted in pegmatites of Aheri area (Chandrapur district) and Mosam area (Gadchiroli district), Maharashtra including samarskite and fergusonite in association with columbite-tantalite, tapiolite and microlite (Table 7.14). Solitary occurrence of cassiterite is also noted in Chapegharhi pegmatite in …Web
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In the Yichun granite complex (SE China), columbite group minerals, microlite and cassiterite are the main Nb, Ta, Sn-bearing minerals. They are mainly concentrated in the uppermost albite-lepidolite granite.Web
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Tapiolite [FeTa 2 O 6] and columbite-group minerals [(Fe,Mn)(Ta,Nb) 2 O 6] are common Nb-Ta-bearing accessory minerals in rare-element granites and pegmatites.Their compositional gap has inspired several experimental studies, but none of them have succeeded in reproducing the parameters that influence the compositional gap.Web
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The remoteness of the compositional field of columbite–tantalite of the Kester Deposit from the tapiolite-tantalite immiscibility domain on the columbite rectangular diagram (see Fig. 3) indicates the high activity of volatiles (P, F, and B), and decreased temperature and pressure of the mineral-forming medium, whereas similar features of ...Web
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The columbite-tantalite occurring in No31 pegmatites showed faint oscillatory zonation and complex patchy zonation patterns in back-scattered electron images. Microprobe analyses revealed that columbite-tantalite in the pegmatites has a wide range of composition. ... 12 Tapiolite [FeTa2O6] and columbite-group minerals …Web
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The following natural mineral and metal standards were used: columbite (Nb Lα), tapiolite (Ta Lα), magnetite (Fe Kα), rhodonite (Mn Kα), scandium (Sc Kα), rutile (Ti …Web
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Similarly, the mineralogy of heavy mineral concentrates from the Jos Plateau placer deposit in Nigeria is completely different to that of the Ngoura deposit, and characterized by columbite-(Fe), tantalite-(Fe) and columbite-(Mn), tapiolite, ixiolite, microlite, fergusonite, euxenite and cassiterite (Mücke and Neumann 2006).Web
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They display a wide range of composition including all types of columbite group minerals, wodginite, tapiolite and microlite. The internal texture of columbite …Web
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Such a mobile residual melt could separate from solidifying pegmatite, alter primary columbite-tantalite mineralization, and promoted precipitation of secondary wodginite and tapiolite-(Fe). It could also be the source of cogenetic tapiolite-wodginite-cassiterite-tantalite associations ( Fig. 11 b).Web
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Columbite-group minerals, especially tantalite-(Mn), and tapiolite are commonly associated in highly fractionated rare-element granites and pegmatites (Černý et al. 1989; Wang et al. 1997;Novàk ...Web
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Chemical compositions that suggest tantalite-Fe are much more commonly tapiolite-Fe than tantalite-Fe. As a bonus, tantalite-Mn is redder and may actually be very red instead of black. ... if you found a specimen in the columbite-tantalite group, it would almost automatically be called columbite, even though chemical tests were rarely, if ever ...Web
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The ferro tapiolite fer ro-to mangano tantalite II pai r (sample MT-2) exhibits remarkab le divers ity in the tielin es linking coe xisting miner als (Fig. 3c). Su chWeb
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Tantalite, occurring as intergranular tabular crystals, was reported for the first time in the Suzhou granite. Electron microprobe analyses show that it is rich in W and Ti, with a Ta/(Ta + Nb) ratio ranging from 0.5 to 0.73 and a Mn/(Mn + Fe) ratio between 0.20 and 0.40. It is structurally distinct from isomorphic tapiolite by a remarked Ag Raman …Web
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The primary Nb–Ta oxide minerals show a sequence from columbite-(Fe) (zone I) through tantalite-(Fe) (zone II) to tantalite-(Mn) (zone III), but distinctly become columbite + wodginite in zone IV and, rarely, columbite in the zone V. Microscopic tapiolite-(Fe) is identified as a product of exsolution in cassiterite from the zones II–III ...Web
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Ferrocolumbite (FeNb 2 O 6), mangano-columbite (MnNb 2 O 6) and mangano-tantalite (MnTa 2 O 6) are the end members of columbite-tantalite (Graham …Web
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The variations in appearance, colour and reflectance between columbite and tantalite are almost imperceptible, as can be seen in the zoned crystal of Fig. 36.2a. However, other images of different samples of columbite and tantalite, as well as tapiolite (tp) associated with tantalite (Figs. 36.3 to 36.10), are also presented for comparison.Web
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Columbite–Tantalite of the Kester Deposit (Eastern Yakutia) ... Similar systems include columbite-tantalite mineralization of rare-metal lithium-fluoric granites …Web
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columbite; crystal growth; crystals; Far East; granites; high-field-strength elements; igneous rocks; metals; mineral assemblages; mineralization; niobates; …Web
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Coexisting crystals of columbite-tantalite and tapiolite form tight . 60. clusters with end-member compositions which systematical shifts in experimental data . 61. and natural samples. This ...Web
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Tapiolite [FeTa 2 O 6 ] and columbite-group minerals [(Fe,Mn)(Ta,Nb) 2 O 6 ] are common Nb-Ta-bearing accessory minerals in rare-element granites and pegmatites. Their compositional gap has inspired several experimental studies, but none of them have succeeded in reproducing the parameters that influence the compositional gap. In this …Web
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The extreme enrichments of columbite-tantalite in Ta, and of zircon in Hf, as well as the occurrence of uranmicrolite and tapiolite, indicate an elevated evolution of the Koktokay No. 3 granitic ...Web
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Columbite-tantalite recovery was the highest at 3:1 BHA–SIBX among the tested collector suites. Using the 3:1 mixed BHA–SIBX collector yielded a more negative columbite-tantalite in comparison to that measured with BHA alone. This indicated the improved adsorption of the BHA–SIBX mixture on the columbite-tantalite surface and …Web
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Renamed to ferrotapiolite in 1983 to distinguish it from manganotapiolite. Later renamed to tapiolite- (Fe). Type Locality: ⓘ Tapiolite- (Fe) type locality, Kulmala, Sukula Pegmatites, Tammela, Kanta-Häme, Finland. Dimorph of: Columbite-Tantalite. Tapiolite- (Fe)-Tapiolite- (Mn) Series. Much more common than tapiolite- (Mn).Web
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Tapiolite, tp, is traditionally (Fe,Mn)(Ta,Nb) 2 O 6, that is, a mineral of variable composition between a ferriferous term, ferrotapiolite, and a manganiferous term, manganotapiolite.In nature, the first is more common and the second, very rare; likewise, Ta dominates over Nb. Tapiolite contains up to 84% Ta 2 O 5, while Nb-rich varieties …Web
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Corpus ID: 133566977; The association of columbite, tantalite and tapiolite in the Suzhou Granite, China @article{Cheng1997TheAO, title={The association of columbite, tantalite and tapiolite in the Suzhou Granite, China}, author={Wang Cheng and François Fontan and Xuedong Jin and Chen Ming and Pierre Monchoux}, …Web
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The crystal chemistry of tapiolite is more complicated than previously recognized. Perusal and synthesis of relatively recent publications reveals a 'hidden' story about tapiolite, one that: (1) permits quantification of the effects of Mn, Fe 3+, Ti (and Sn) upon the unit-cell parameters of maximally ordered tapiolite; (2) shows that the effect of …Web
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Wang Ru Cheng, Francois Fontan, Xu Shi Jin, Chen Xiao Ming, Pierre Monchoux; The association of columbite, tantalite and tapiolite in the Suzhou Granite, China. The Canadian Mineralogist 1997;; 35 (3): 699–706. doi:Web
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T antalum and tin oxides (mainly columbite-tantalite, tapiolite, microlite, cassiteri te) i n stream sediments fr om catchments that . contain the Leinster LCT pegmatites show the same textural and.Web
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