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POLYCRASE [2 records]

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

Save record 1

Record 2 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 2

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