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EUXENITE [4 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2021-07-14

English

Subject field(s)
  • Mineralogy
  • Economic Geology
Universal entry(ies)
(Y,Ca,Ce,U,Th)(Ti,Cb,Ta)2O6
formula, see observation
DEF

A black mineral composed of titanate, columbate, and tantalate of yttrium-group metals ...

OBS

... it is isomorphous with euxenite and occurs in granite pegmatites.

OBS

Chemical formula: (Y,Ca,Ce,U,Th)(Ti,Cb,Ta)2O6

French

Domaine(s)
  • Minéralogie
  • Géologie économique
Entrée(s) universelle(s)
(Y,Ca,Ce,U,Th)(Ti,Cb,Ta)2O6
formula, see observation
CONT

Les polycrases sont brun-noir avec, en principe, une masse spécifique plus élevée [que l'euxénite.]

OBS

Formule chimique : (Y,Ca,Ce,U,Th)(Ti,Cb,Ta)2O6

Spanish

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Record 2 2016-02-12

English

Subject field(s)
  • Mineralogy
  • Economic Geology
DEF

A silicate mineral belonging to the sorosilicate group and used as a source of scandium.

OBS

It is the only mineral rich in scandium... It is a very rare, weakly radioactive, monoclinic mineral; grayish-green when fresh, white to reddish-gray by alteration; found in pegmatites associated with monazite and euxenite; also found with beryl, strueverite, monazite, and possibly, fergusonite.

French

Domaine(s)
  • Minéralogie
  • Géologie économique
OBS

On a signalé à Madagascar une yttrialite riche en scandium, la «thortveitite».

Spanish

Campo(s) temático(s)
  • Mineralogía
  • Geología económica
DEF

Silicato de escandio e itrio que cristaliza en el sistema monoclínico.

Save record 2

Record 3 2010-09-22

English

Subject field(s)
  • Mineralogy
Universal entry(ies)
(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
formula, see observation
DEF

A brownish-black mineral [which] is isomorphous with polycrase and occurs in granite pegmatites.

OBS

Chemical formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6

French

Domaine(s)
  • Minéralogie
Entrée(s) universelle(s)
(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
formula, see observation
DEF

Minéral (oxyde) de terres rares, brun-noir, lustré, brillant à vitreux, du système cristallin orthorhombique.

CONT

[...] type riche en columbium, l'«euxénite» [...] Ces minéraux sont [...] orthorhombiques [...] Les «euxénites» sont noires et opaques, quelquefois tirant sur le noir verdâtre, cassure conchoïdale, éclat brillant, submétallique et un peu vitreux; d = 6, [la masse spécifique] = 5,0 en moyenne. [...] Les euxénites sont surtout thorifères [...] dans le bouclier canadien, certaines pegmatites sont spécialement riches en euxénites.

OBS

Formule chimique : (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6

Spanish

Campo(s) temático(s)
  • Mineralogía
Entrada(s) universal(es)
(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
formula, see observation
DEF

Titanoniobato de itrio, cerio y uranio, cristalizable en el sistema ortorrómbico; se encuentra en forma de prismas pardos o negruzcos, presentes en las pegmatitas graníticas. Constituye una mena secundaria del uranio.

Save record 3

Record 4 2005-04-07

English

Subject field(s)
  • Mineralogy
DEF

A black or brown mineral :... It is a variety of euxenite with Ta [tantalium] largely or almost entirely substituting for Nb [nionium].

French

Domaine(s)
  • Minéralogie
DEF

Oxyde d'yttrium, de tantale, de titane et de niobium cristallisant dans le système orthorhombique; il est vraisemblablement identique à l'«yttrotantalite».

CONT

La tanteuxénite forme des cristaux allongés ou de petits amas noirâtres à aspect de poix, avec une cassure conchoidale.

Spanish

Campo(s) temático(s)
  • Mineralogía
DEF

Mineral negro, consistente en un titanato de hierro, itrio y uranio; cristaliza en el sistema ortorrómbico.

Save record 4

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