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IMPERIAL TOPAZ [1 record]

Record 1 2011-01-17

English

Subject field(s)
  • Mineralogy
  • Jewellery
  • Gemmology
Universal entry(ies)
AL2SiO4(F,OH)2
formula, see observation
DEF

A transparent mineral species, the best-known color varieties of which are brownish yellow, yellow-brown, an orangy brown; ...

CONT

This gem mineral is sometimes called precious topaz, to distinguish it from citrine, or topaz-quartz, with which it has long been confused.

OBS

Chemical formula: Al2SiO4(F,OH)2

French

Domaine(s)
  • Minéralogie
  • Joaillerie et bijouterie
  • Gemmologie
Entrée(s) universelle(s)
AL2SiO4(F,OH)2
formula, see observation
DEF

Nésosilicate du système cristallin orthorhombique [qui] se présente en prismes assez trapus, à faces finement cannelées, jaune ou incolore, bleuâtre, verdâtre.

OBS

Topaze noble ou précieuse. Deux qualificatifs inutiles, le topaze est un nom qui se suffit à lui-même et ces adjectifs n'étaient utilisés jadis que lorsque le quartz jaune était confondu avec la citrine (quartz jaune).

OBS

Formule chimique : Al2SiO4(F,OH)2

Spanish

Campo(s) temático(s)
  • Mineralogía
  • Artículos de joyería
  • Estudio de las gemas
Entrada(s) universal(es)
AL2SiO4(F,OH)2
formula, see observation
DEF

Fluosilicato de aluminio [...] que cristaliza en el sistema rómbico; se encuentra en forma de cristales prismáticos, muy brillantes, a veces incoloros, pero generalmente amarillos, muy apreciados en joyería [...]

OBS

Fórmula química: Al2SiO4(F,OH)2

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