Columbite Tantalite Cassiterites

Columbite: The mineral columbite-tantalite information and pictures

Columbite is the niobium-rich member, and Tantalite is the tantalum-rich member. Columbite is named after its niobium content, which was previous known as columbium prior to its renaming. Columbite is the most important mineral containing the rare element niobium and is its main ore. The name Columbite has been discredited by the IMA, with …

Combined zircon and cassiterite U–Pb dating of the Piaotang …

Spodumene occurs mainly in the shallow albite pegmatites (55–105 m depth), and disseminated beryl, columbite-tantalite, and cassiterite, mainly occur in pegmatites at depths less than 700 m. ... Cst-IVa cassiterites have similar W, Nb, and Ta contents but much higher Ti contents compared to Cst-IIIb cassiterites related to primary magmatic ...

LA-ICP-MS dating of high‑uranium columbite from no. 1 …

Columbite-tantalite group minerals (CGMs) as an important source for strategic elements, Nb and Ta, frequently occur in highly evolved granites and granitic pegmatites (Linnen et al., 2012). ... According to the CL characteristics, cassiterites in Nanping No.31 pegmatite vein from five zones are divided into two groups, CASS-1 …

(PDF) Multiple tin mineralization events in Africa: …

Kalimbi cassiterites have relatively young U ... (U-Pb on columbite-tantalite and cassiterite; Dewaele et al., 2011;Melcher et al., 2015; Zhang et al., 2016). Furthermore, G4granite associated, W ...

The geochronology of the rare metal pegmatite deposits

The age of apatite, cassiterite, columbite-tantalite (coltan) from five zones in Nanping No.31Li–Cs–Ta-rich type pegmatite deposit show remarkable two group ages (370–390 Ma and 145–160 Ma). ... According to the CL characteristics, cassiterites in Nanping No.31 pegmatite vein from five zones are divided into two groups, CASS-1 …

U–Pb geochronology of columbite-group mineral

Abbreviations: Clb = columbite; Ttl = tantalite. Cassiterite is locally intergrown with CGM along porous rim-1, which hosts uranmicrolite ((U,Ca) 2 (Ta,Nb) 2 …

Substitution of tin in cassiterite by tantalum, niobium, tungsten, …

Disregarding the randomly occurring Ta-Nb inclusions, such as listed in Table 4, we agree with HAAPALA ( 1977) who reported cassiterites from Eurajaki/Finland in which Ta, Nb and Fe are distributed "relatively homogenously". However, some of the Ta and Nb is present in discrete mineral phases, most probably tapiolite or columbite.

2018 Minerals Yearbook

tantalite ore prices had remained at $193 per kilogram of contained Ta 2 O 5 since november 2014. The increases in price in 2018 were thought to have resulted from a combination of increased demand from downstream consumers, increased royalties on exports of columbite-tantalite ore signed into law by the Government of Congo …

What coltan mining in the DRC costs people and the environment

The mineral is refined to tantalum powder, which is used to make heat-resistant capacitors in laptops, cellphones, and other high-end electronic devices. The global coltan market was valued at US ...

Age of the Dahongliutan rare metal pegmatite deposit, West …

U-Pb dating of columbite-tantalite (e.g., Romer and Wright, 1992, Romer and Smeds, ... (Ta) and pure metal Nb (Nb) standards were used in the analytical procedure of cassiterites. Matrix effects were corrected using the ZAF software provided by JEOL. The accuracy of the reported values for the analyses is 1–10% depending on the abundance …

Ultrastructure of a Columbite-Tantalite Mineral from the

The formation of columbite-group mineral phases in peraluminous granite has not been demonstrated to date. Here, a nanoscale study of the columbite-tantalite mineral in the Zhaojinggou Nb-Ta deposit in North China Craton elucidated its formation mechanism and the role of fluids in Nb-Ta mineralization. Transmission electron …

Tantalite: The mineral columbite-tantalite information and pictures

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 ...

Columbite-Tantalite – WGNHS – UW–Madison

Columbite-(Fe) in tabular crystal from the Nine Mile pluton near Wausau in Marathon County, Wisconsin. Scanning electron microscope image. (Photo by Al Falster.) Columbite-tantalite refers to a group of minerals having varying amounts of iron, manganese, niobium, and tantalum. They are found as platey black grains in complex granitic pegmatites. …

Quantitative evaluation of metamictisation of columbite-(Mn) from …

Introduction. Niobium and tantalum are critical metals that have been used increasingly in advanced technologies (e.g. information technology, energy, aerospace, national defence and military, Linnen et al., Reference Linnen, Van Lichtervelde and Černý 2012).Members of the columbite–tantalite solid-solution series are a major mineral …

Chemistry of columbite-tantalite minerals in rare metal granitoids

The columbite-tantalite commonly exhibits a mottled or patchy zoned texture with the rims consistently higher in Ta than the cores, reflecting the later effect of a …

(PDF) Secondary Recovery of Columbite from Tailing …

The recovery and separation efficiency were 77.95% and 77.88% in that order. The magnetic and gravity concentrations were found effective at 77.95% recovery for columbite from the Rayfield tailing ...

Cassiterite

Clear yellowish or honey-colored cassiterites are classed as gemstones. Iron, Mn, Ta and Nb can substitute for Sn with a combination of divalent and pentavalent elements replacing the tetravalent Sn following the relationship: ... columbite, tantalite, scheelite and hematite such as the wolframite–cassiterite mineralization at Cligga Head ...

U-Pb columbite-tantalite chronology of rare-element

The columbite-tantalite series [ (Fe,Mn) (Ta,Nb) 2 O 6] are the most common Nb-Ta species in rare-element pegmatites. The end members ferrocolumbite (FeNb 2 O 6 ), manganocolumbite (MnNb 2 O …

Coltan and Mobile Phones: The Wonders & the Sad Truth About It

Australia was initially the largest producer of columbite-tantalite in the world, closely followed by Canada and Brazil. In 2006 alone, the three countries had an 80% share of total columbite-tantalite produce. However, their production of coltan went downhill following environmental regulations and unsuccessful mining company buyouts.

Columbite-tantalite and cassiterite as indicator minerals for lithium …

Columbite-tantalite and cassiterite as indicator minerals for lithium pegmatites: Implications from geospatial and mineralogical analyses of stream sediments in southeast Ireland. January...

U-Pb and reconnaissance Lu-Hf isotope analysis of cassiterite …

New U–Pb dating CGMs (columbite-tantalite group minerals) in five zones have a consistent age (380 ± 10 Ma). Whilst U–Pb dating of apatite and cassiterite from different structural zones show remarkable two group …

Mineralogical and chemical evolution of tantalum–(niobium–tin

The presence of cassiterites and some personal information from the authors demonstrate that most of these samples were collected within the Vichada Department ... Columbite-tantalite, cassiterite ...

Mineralogical constraints on the magmatic

The columbite-group minerals are associated with rock-forming minerals and intergrown with cassiterites and zircons occasionally (Fig. 9 a,c). ... Columbite–tantalite quadrilateral diagram for the classification of columbite-group minerals (CGMs) from the Bailongshan (a) 2# pegmatite and (b) 5# pegmatite.

Influence of fluorine on the solubility of

Introduction. Tantalum (Ta) and niobium (Nb) are both key metals in high technology industrial processes. The most economically important Ta–Nb-containing minerals are those of the columbite–tantalite-group ((Fe,Mn)(Ta,Nb) 2 O 6) and wodginite (Mn(Sn,Ta)Ta 2 O 8).These minerals are found especially in granitic pegmatites or highly …

Magmatic–hydrothermal rare-element mineralization in the …

In the Songshugang granite, complex intergrowths of columbite–tantalite, Ta-rich cassiterite, ferberite, and Hf-rich zircon imply multiple stages of crystallization in magmatic–hydrothermal environments. ... Cassiterites are present as euhedral to subhedral crystals in almost all the drill-hole samples. They may occur independently (Fig. 6 ...

Tantalum (Ta) [Z = 73]

The columbite group is a solid solution with varying proportions of Nb or Ta in its composition. According to the International Mineralogical Association (IMA), 'tantalite' or 'coltan' are not scientific names, yet they are widely used. Many specimens commonly named tantalite are actually minerals of the columbite or tapiolite group ...

Late Neoproterozoic overprinting of the cassiterite and columbite

The internal texture of columbite-tantalite exhibits a multiple zoning pattern indicating primary composition modified by the extreme fractionated, volatile and water saturated residual melt. Hydrothermal origin of columbite-tantalite is observed in greisens, expressed by a higher W concentration and coeval or even younger crystallization ...

Amphibolites in the rare metal- and tin-bearing …

beryl, columbite–tantalite ± cassiterite; type IV: replaced lepidolite–albite–muscovite pegmatites with amblygonite, cassiterite, beryl ± columbite– tantalite; and type V: replaced muscovite–albite pegmatites with cassiterite and beryl (Ramesh Babu 1993, 1999). Amphibolites occupy a large part of the study area.

Secondary Recovery of Columbite from Tailing Dump in Nigerian …

Columbite contains oxide of niobium (Nb2O5) and oxide of tantalum (Ta2O5) in different proportions. When the niobium oxide is much more than the tantalum oxide, the mineral is called columbite {(Fe, Mn)Nb2O6}, while it is called tantalite {(Fe, Mn)Ta2O6}, when the tantalum oxide content is much higher.

Constraints on tin mineralization events by cassiterite

cassiterites with high common Pb, because the former is ... granite and in-situ columbite-tantalite U–Pb ages of the pegmatites (975 ± 8 Ma to 966 ± 9 Ma; Dewaele et al.