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METAUX RARES [8 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2026-03-25

English

Subject field(s)
  • Chemistry
  • Geochemistry
DEF

A group of elements having atomic numbers from 57 to 71 usually with the inclusion of scandium and yttrium, which though outside this range, have similar properties.

OBS

These [metals] have the source arrangement of the two external shells of electrons in their atoms, and resemble one another very closely in chemical and physical properties, being thus most difficult to separate from each other. It is to this, rather than their actual rarity in nature, that they are so described.

Key term(s)
  • rare-earth metals

French

Domaine(s)
  • Chimie
  • Géochimie
CONT

On désigne sous le nom de «métaux des terres rares» quinze éléments consécutifs de la classification, allant du numéro 57 au numéro 71. Ce sont le lanthane, le cérium, le praséodyme, le néodyme, le prométhéum, le somarium, l'europium, le gadolinium, le terbium, le dysprosium, l'holmium, l'erbium, le thulium, l'hytterbium et le lutétium. À ce groupe on adjoint fréquemment le scandium et l'yttrium, de propriétés très voisines.

Key term(s)
  • métaux de terres rares

Spanish

Campo(s) temático(s)
  • Química
  • Geoquímica
Save record 1

Record 2 2004-07-13

English

Subject field(s)
  • Petrography
  • Geochemistry
CONT

Peraluminous to subalkaline rare metal granites with associated lithium, beryllium, niobium, and tantalum, as well as tungsten and tin mineralization ... are the closest relatives to pegmatite deposits. Some rare metal granites display pegmatitic cupolas ...

French

Domaine(s)
  • Pétrographie
  • Géochimie
CONT

Les granites hyperalumineux à subalcalins qui contiennent des métaux rares associés à des concentrations de lithium, de béryllium, de niobium et de tantale, ainsi que des minéralisations d'étain et de tungstène [...] s'apparentent le plus aux pegmatites minéralisées. Certains granites à minéralisation de métaux rares comportent des coupoles pegmatitiques [...]

Spanish

Save record 2

Record 3 2004-03-09

English

Subject field(s)
  • Mineralogy
CONT

... the principal rare metal-bearing minerals are typically disseminated throughout the ore-forming unit and represent essential constituents that crystallized with their host rocks.

French

Domaine(s)
  • Minéralogie
CONT

[...] les principaux minéraux contenant des métaux rares sont en général disséminés dans l'unité minéralisée et représentent des constituants essentiels ayant cristallisé avec leurs roches hôtes.

Spanish

Save record 3

Record 4 2004-02-18

English

Subject field(s)
  • Metals Mining
CONT

Deposits of rare metals in peralkaline rocks occur in all rock types without regard for silica activity.

French

Domaine(s)
  • Mines métalliques
CONT

Les gîtes de métaux rares dans des roches hyperalcalines se trouvent dans tous les types de roches, quel que soit le niveau d'activité de la silice.

Spanish

Save record 4

Record 5 2004-02-06

English

Subject field(s)
  • Metals Mining
CONT

The elements of economic interest in peralkaline rock-associated rare metal deposits include zirconium (Zr), niobium (Nb), beryllium (Be), uranium(U), thorium (Th), tantalum (Ta), rare-earth elements (REEs), yttrium (Y), and gallium (Ga). Commonly several elements are concentrated in a deposit.

French

Domaine(s)
  • Mines métalliques
CONT

Parmi les éléments d'intérêt économique des gîtes de métaux rares associés à des roches hyperalcalines figurent le zirconium (Zr), le niobium (Nb), le béryllium (Be), l'uranium (U), le thorium (Th), le tantale, les éléments des terres rares (ÉTR), l'yttrium (Y) et le gallium (Ga). En général, plusieurs éléments sont concentrés dans un gîte unique.

Spanish

Save record 5

Record 6 1999-10-21

English

Subject field(s)
  • Metals Mining
  • Chemistry
DEF

A loose term for less common and more expensive metallic elements. Included are the alkaline-earth metals barium, strontium, and beryllium, also bismuth, cadmium, cobalt, columbium (niobium), gallium, germanium, hafnium, indium, lithium, molybdenum, rhenium, selenium, tantalum, tellurium, thallium, thorium, titanium, tungsten, uranium, vanadium, and zirconium.

Key term(s)
  • rare metal

French

Domaine(s)
  • Mines métalliques
  • Chimie
Key term(s)
  • métal rare

Spanish

Campo(s) temático(s)
  • Minas metálicas
  • Química
Key term(s)
  • metal raro
Save record 6

Record 7 1991-01-21

English

Subject field(s)
  • Organizations, Administrative Units and Committees

French

Domaine(s)
  • Organismes, unités administratives et comités

Spanish

Save record 7

Record 8 1986-06-02

English

Subject field(s)
  • Mineralogy
Key term(s)
  • less common metal

French

Domaine(s)
  • Minéralogie
Key term(s)
  • métal moins usuel
  • métal plus rare

Spanish

Save record 8

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