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DICROITA [1 record]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-06-17

English

Subject field(s)
  • Mineralogy
  • Gemmology
DEF

A light- to dark-blue or violet-blue orthorhombic mineral which consists of a silicate of aluminum and magnesium, and exhibits strong pleochroism.

OBS

dichroite: Obsolete synonym for cordierite.

OBS

Cordierite [is] strongly different in color in different crystal directions, changing in a small grain from violet-blue to grayish as it is turned (hence, one of its name, "dichroite").

OBS

Cordierite is also known ... as dichroite because of its remarkable color change.

OBS

Cordierite ... is named after the French geologist P.L.A. Cordier.

French

Domaine(s)
  • Minéralogie
  • Gemmologie
DEF

Minéral du système orthorhombique, constitué d'un silicate d'aluminium et de magnésium de couleur bleu vif à bleu-violet et bleu-vert à grisâtre.

CONT

Orthorhombique en facies prismatique [...] Les beaux cristaux sont [...] assez exceptionnels. La teinte naturelle de la cordiérite est le bleu noir, à éclat très gras. Les belles variétés, rares à la vérité, sont d'un très beau bleu profond; [...] Cet élément est dur, d = 7,5 de masse spécifique qui varie de 2,55 à 2,65, [...] Elle possède la particularité de transmettre sélectivement les couleurs à partir de la lumière blanche [...] ce phénomène, particulièrement important dans la cordiérite, s'appelle le dichroïsme, d'où le nom de dichroïte [...]

OBS

cordiérite : Étymologie : en l'honneur du géologue français Cordier.

Spanish

Campo(s) temático(s)
  • Mineralogía
  • Estudio de las gemas
DEF

Silicato de aluminio y magnesio [...] en cuya composición una parte del magnesio puede ser reemplazada por hierro o por manganeso.

OBS

Cristaliza en el sistema rómbico y sus cristales policromos, de forma prismática, se encuentran en las rocas metamórficas.

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