Columbite Tantalite Gt

Columbite - Wikipedia

Columbite, also called niobite, niobite-tantalite and columbate [(Fe, Mn)Nb2O6], is a black mineral group that is an ore of niobium. It has a submetallic luster and a high density and is a niobate of iron and manganese. This mineral group was first found in Haddam, Connecticut, in the United States. It forms a series with the tantalum-dominant analogue ferrotantaliteand one with the manganese-dominant analogue manganocolumbite. The iron-rich member of the columbite group is ferrocolumbite. Some tin and tungs…

COLOMBITE-TANTALITE - Encyclopædia Universalis

La tantalite, (Fe,Mn)Ta2O6, et la colombite (on écrit aussi columbite), ou niobite (Fe,Mn)Nb2O6 constituent une série de mélanges minéraux isomorphes : les colombo-tantalites. Les teneurs en colombo-tantalates, ou niobo-tantalates, et en ferromagnésiens varient beaucoup, et même à l'intérieur d'un gîte de petite dimension. À cette série on trouve quelquefois associés l'

Coltan - Wikipedia

Coltan (short for columbite–tantalites and known industrially as tantalite) is a dull black metallic ore from which are extracted the elements niobium and tantalum.The niobium-dominant mineral in coltan is columbite (after niobium's original American name columbium), and the tantalum-dominant mineral is the tantalite.. Tantalum from coltan is used to manufacture tantalum capacitors which are ...

Columbite | mineral | Britannica

Columbite, hard, black (often iridescent), heavy oxide mineral of iron, manganese, and niobium, (Fe, Mn)Nb 2 O 6. Tantalum atoms replace niobium atoms in the crystal structure to form the mineral tantalite, which is similar but much more dense.These minerals are the most abundant and widespread of the naturally occurring niobates and tantalates and are important ores, their elements niobium ...

Coltan — Wikipédia

Le coltan (mot-valise pour colombite-tantalite) est un minerai de couleur noire ou brun-rouge dont on extrait le niobium (d'abord appelé colombium) et le tantale.Il est formé par l'association de deux minéraux, la colombite (ou columbite) [(Fe, Mn)Nb 2 O 6] et la tantalite [(Fe, Mn)(Ta, Nb) 2 O 6], en proportion variable.. La colombite a été découverte en Nouvelle-Angleterre (États-Unis).

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Columbite-Tantalite: Mineral information, data and …

Distinctive compositional trends in columbite-tantalite from two segments of the lepidolite pegmatite at Rozna Western Moravia, Czech Republic. Journal of GEOsciences, 46(1-2), 1-8. Journal of GEOsciences, 46(1-2), 1-8.

Tantalite - Wikipedia

The mineral group tantalite [(Fe, Mn)Ta 2 O 6] is the primary source of the chemical element tantalum.It is chemically similar to columbite, and the two are often grouped together as a semi-singular mineral called coltan or "columbite-tantalite" in many mineral guides. However, tantalite has a much greater specific gravity than columbite (8.0+ compared to columbite's 5.2).

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Columbite-(Fe) - Anglais-Français Dictionnaire - Glosbe

columbite-tantalite colombite-tantalite, colombo-tantalite, colombotantalite [n.f.], coltan [n.m.], coltan, columbite-tantalite, columbo-tantalite, columbotantalite, niobo-tantalite, niobotantalite. stemming. Exemple de phrases avec "Columbite-(Fe)", mémoire de traduction. add example. en Impact on children of illicit exploitation of natural resources in conflict zones The illicit ...

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Columbite - Professional Mining Research

Results for :Columbite . Columbite,Columbite Information,Columbite Uses,Columbite Suppliers geologists still refer to its name sake mineral as columbite instead of the proposed "niobite a semi-singular mineral called columbite-tantalite in many mineral guides. A series is Minerals Zone > Industrial Minerals > Columbite

Minerals of the tantalite-niobite series from …

Les données chimiques et physiques des minéraux de la série tantalite-niobite provenant du district de Zambézia, Mozambique du nord, sont décrits dans cette étude. Les échantillons présentés en premier lieu sont des enrichissements commerciaux de « tantalite ». La composition chimique varie entre la manganotantalite pure (de roussâtre à presque incolore) et la niobite ...

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Columbite in French - English-French Dictionary - …

Molecules of coltan, which is short for columbite tantalite. Des molécules de coltan, l'abréviation de colombite-tantalite. Copy to clipboard; Details / edit; Termium. columbite. The columbite in the TZ is strongly enriched in W, up to 32.6 wt% WO3. La columbite de la zone de transition ZG-PG est très enrichie en W (jusqu'à 32.6 wt. Copy to clipboard; Details / edit; wikidata ...

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Prof. Dr. Bernd Lehmann ; Technical University of Clausthal : phone ++49-5323-722776 ... Late Neoproterozoic overprinting of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa). Journal of African Earth Sciences 61: 10-26. Xu LG, Lehmann B, Mao JW, Qu W, Du A (2011) Re-Os age of polymetallic Ni-Mo-PGE-Au mineralization in Early …

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