Especially the association of columbite–tantalite with microlite and wodginite has been described as primary magmatic (Van Lichtervelde et al. 2007). However, at Kenticha, microlite-group minerals are clearly secondary in origin, replacing Mn-bearing columbite/tantalite. Ta mineralization at Kenticha is not accompanied by cassiterite.Web

The main compositions identified are columbite-(Mn) and columbite-(Fe), but Fe- and Mn-tantalites are also important minerals as well as ixiolite–wodginite. Most …Web

titanian ixiolite, titanian columbite-tantalite, fersmite and microlite. Fissures generated in the Nb, Ta oxide minerals during deformation are filled with titanite, formed by reaction of the oxide minerals with metamorphic pore fluids. ... Formulas of rutile and columbite-tantalite are calculated on the basis of 4 and 24 oxygens, respectively ...Web

In ia, tantalum is primarily found within the minerals tantalite, columbite, wodginite, and pyrochlore or microlite. Such minerals are common in pegmatites that have often been mined for other resources. ... and tantalite-columbite since 1929. Open cuts, pits, trenches, shafts, and drill holes expose and explore the underlying pegmatite ...Web

The most common are columbite, tantalite and microlite. Columbite and tantalite are the end members of a solid-solution called the columbite-group minerals, (Fe,Mn)(Nb,Ta) 2 O 6. Microlite, (A) 2 (B) 2 6 (O,OH,F)), with A=REE,U,Y, Ca,Na nd B=Ta,Nb, Ti, is the Ta-rich member of the pyrochlore group minerals. Tantalum canWeb

Results demonstrate that the main tantalum-niobium minerals include tantalite, columbite, tantalum-niobite, and microlite; these minerals are finely disseminated and nearly below 0.040 mm in size. The occurrence of niobium minerals is more complex than that of tantalum minerals; thus, a lower recovery for niobium than …Web

The Tin Mountain mine, located 20 miles (13.5 km) west of Custer, produced very little tin (cassiterite) but mined spodumene, pollucite, with minor amounts of beryl, columbite-tantalite, microlite ...Web

To fill in the gap, McNeil et al. (2020) conducted the experimental studies on the solubilities of wodginite, titanowodginite, microlite and pyrochlore, and compared the results to columbite-(Mn) and tantalite-(Mn) solubilities in a flux-rich haplogranitic melt at 700 to 850 °C and 200 MPa. It is shown that all these minerals have similar ...Web

are columbite-tantalite, microlite, wodginite, and euxenite (Hatcher and Bolitho, 1982; Trueman and Černý, 1982; Černý, 1991a; Hatcher and Clynick, 1990). Pegmatites hosting Ta deposits that have been exploited in the past (e.g. Wodgina and Greenbushes, Australia; Tanco, Canada; and Kenticha, Ethiopia) typically belong to the LCT family.Web

Columbite-tantalite in general occurs as free particles, as small inclusions in cassiterite, and intergrown with cassiterite as well as quartz in simple and mottled type of intergrowth. Some columbite-tantalite shows replacement by microlite along the margin and/or along the fractures of the particles. From Omkoi area, columbite-tantalite ...Web

It occurs as fine-grained disseminated columbite-tantalite and microlite (Reyf et al. 2000; Webster et al. 2004; Dolgopolova et al. 2004). Intense albitization and greisenization was accompanied by formation of amazonite, lepidolite and zinnwaldite (Reyf et al. 2000). A lamprophyre dike cross cuts the mineralization (Fig. 12).Web

Tantalite is the tantalum-rich member, and Columbite is the niobium-rich member. Tantalite is named after its tantalum content, and, together with Columbite, are the most important minerals containing the rare element tantalum. The name Tantalite has been discredited by the IMA, with the more specific designations of Tantalite- (Fe) (also known ...Web

ABsrRAcr Compositions of 45 ferrotapiolite-tantalite pairs from 12 granitic pegmatites were analyzed by electnon microprobe to establish empirically the shape, extent and position of the two-phase field in the columbite quadrilateral. The field is perceptibly broader than that defined earlier on the basis of single-phase samples. The compositions …Web

Member of: Columbite Group > Columbite Supergroup. Name: From the manganese content and for the Greek mythical figure Tantalus - for its difficulty in dissolving. Type Locality: ⓘ Utö Mines, Utö, Haninge, Stockholm County, Sweden. Tantalite- (Fe)-Tantalite- (Mn) Series and Columbite- (Mn)-Tantalite- (Mn) Series. Formerly known as ...Web

Back scattered electron (BSE) images have indicated complex zoning patterns such as oscillatory, patchy and/or their combinations, associated with replacement of columbite-tantalite by microlite ...Web

Niobium and tantalum, rare metals and high field strength elements (HFSEs) that are essential to modern technologies, are concentrated among others in lithium-cesium-tantalum (LCT) pegmatites and rare metal granites. The most important hosts for Nb-Ta in these types of deposits are the columbite group minerals (columbite-tantalite), but at …Web

In all of these deposits, Nb and Ta commonly occur as relatively rare oxides, notably pyrochlore–microlite and columbite–tantalite, rather than as pure metals (Mackay and Simandl, 2014). Rock-forming micas also have a preference for Nb and Ta, with mineral–melt partitioning coefficients of >1 ( Nash and Crecraft 1985 ), and play a key ...Web

The late tantalite-(Mn) (Fig. 8) is depleted in LREE (total REE up to 0.58 ppm) probably due to its co-crystallization with microlite containing high levels of REE. …Web

Li-F granites from the Kester deposit (Yana Plateau in Yakutia, Russia) are proved to be connected with a rare-metal complex of accessory minerals: montebrasite, columbite-(Mn), columbite-(Fe), tantalite-(Mn), Ta-bearing cassiterite, U-bearing microlite, W-bearing ixiolite, niobian ferberite, U–Hf-rich zircon, and Ta-bearing rutile. …Web

The main compositions identified are columbite-(Mn) and columbite-(Fe), but Fe- and Mn-tantalites are also important minerals as well as ixiolite–wodginite. Most of the minor mineral phases occur as small inclusions in columbite–tantalite and consist of cassiterite, zircon, struverite and microlite group minerals.Web

The most common are columbite, tantalite and microlite. Columbite and tantalite are the end members of a solid- solution called the columbite-group minerals, …Web

Columbite-tantalite and cassiterite are the predominant oxide species. On the basis of columbite-tantalite compositions, the ... Minor microlite, antimonian microlite and stibiomicrolite are found ...Web

Solubility of wodginite, titanowodginite, microlite, pyrochlore, columbite-(Mn) and tantalite-(Mn) in flux-rich haplogranitic melts between 700° and 850 °C and 200 MPa Alysha G. McNeil, Robert L. Linnen, Roberta L. FlemmingWeb

They display a wide range of composition including all types of columbite group minerals, wodginite, tapiolite and microlite. The internal texture of columbite …Web

The rare metal minerals, identified from six mineralized pegmatites at Govindpal, Mundaguda, Mundval, Dhuramagurah, Haladikunda and Bacheli, include cassiterite, columbite–tantalite, wodginite, microlite, fersmite and Hf–zircon. Ta–Nb-poor cassiterite is ubiquitous and the most abundant ore mineral in all the mineralized …Web

For the niobium minerals pyrochlore and columbite-(Mn) in ASI 1.0 (ASI Li 0.83) melts, the solubility product of pyrochlore is almost identical to that of microlite (−3.71 mol 3 /kg 3 and -3.78 mol 3 /kg 3 respectively at 750 °C) and columbite-(Mn) has a slightly lower solubility product from that of tantalite (−2.68 mol 2 /kg 2 and -2.32 ...Web

Pegmatite veins bear diverse Ta minerals (columbite, tantalite-columbite, manganotantalite, ixiolite, and microlite) that accumulated rare metals late during the evolution of the pegmatite magmatic system. The discovered mineralogical and geochemical criteria are useful for exploration purposes.Web

The first three analyses are for microlite-II after wodginite; 6 and 7 for microlite-II after columbite–tantalite; 3, 4 and 5 for microlite-II surrounding quartz vein (Fig. 4d) and 78 to 80 are for cassiterite-II in the close vicinity of such microlite. Data are from single point analysis. n.d. = not detected. daguda pegmatite are higher.Web

O) are also known, in association with columbite-tantalite and beryl, from the pegmatites in other parts of Odisha, e.g., Pandikimal and Bathlaira in the Jharsuguda district (northern Odisha), and Baghnadi in the Phulbani district (Ramesh Babu, 1999; Singh and Viswanathan, 2015). Minor amount of zinnwaldite occurs in theWeb

Here, we document the Ta-rich oxide minerals, such as those of the columbite–tantalite group, tapiolite-(Fe) and microlite. It is possible to distinguish a …Web

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. Rutile is the only Nb, Ta-bearing phase in the geochemically primitive muscovite-zinnwaldite granite.Web

2 pegmatite, New Mexico, whose border zone is said to consist of "perthite, quartz, and muscovite, with minor beryl, columbite-tantalite, microlite, apatite, spessartine, and spodumene"; albite is at least locally an appreciable component of that border zone.Web

Pyrochlore supergroup minerals from Li-Cs-Ta enriched (LCT) pegmatites occupy the microlite field (<90% Nb, ≤40% Ti, and > 15% Ta) whereas those from …Web

Abstract The paper presents experimental data on tantalite solubility in water-saturated granitoid melts with various alumina and alkaline elements concentrations at T = 650–850°C and P = 100 MPa. The maximum Ta concentration (effective solubility) in melt is shown to be always higher than the Nb concentration. As the melt composition is …Web

Dissolution textures resulting from the corrosion of columbite and tantalite rims, in particular, are common. The Mn/(Mn + Fe) ratio varies between 0.33 and 0.97 and the …Web

The LFGs of the Abu Dabbab massif containing Ta-bearing cassiterite, tantalite-(Mn), columbite-(Mn), microlite, and wodginite are considered as ores [27,34] (Figure 1b). Based on our petrographic study, the LFGs of the main phase are medium-grained white/light-gray rocks with massive texture that become green-gray amazonite at …Web

This study describes the solubility of wodginite, titanowodginite, microlite, and pyrochlore in comparison to columbite-(Mn) and tantalite-(Mn) in a H 2 O saturated flux …Web

Pegmatite veins bear diverse Ta minerals (columbite, tantalite-columbite, manganotantalite, ixiolite, and microlite) that accumulated rare metals late during the …Web

New data on rare earth element (REE) concentrations and distribution patterns of columbite-tantalite minerals from Ta-ore provinces worldwide are presented. The REE geochemistry was studied by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Five major types of chondrite-normalized REE distribution patterns are …Web