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DOUBLE-REFRACTING SPAR [1 record]

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Record 1 2012-05-01

English

Subject field(s)
  • Mineralogy
DEF

A very pure and transparent variety of calcite, the best of which is obtained in Iceland, that cleaves easily and perfectly into rhombohedrons and that exhibits strong double refraction; an optical calcite. It occurs in vugs and cavities in volcanic rocks and as nodules in residual clays in limestone regions.

French

Domaine(s)
  • Minéralogie
DEF

Variété de calcite pouvant être utilisée en optique en raison de ses qualités de réfraction.

CONT

[La calcite] est un minéral universellement répandu. Il se présente en diverses variétés: le «spath d'Islande», en beaux cristaux dans des géodes ou des filons; le «spath satiné» [...]; les «stalagmites, stalactites» et «pisolites» [...]; le «grès cristallisé de Fontainebleau» [...]; l'«onyx calcaire» [...]

Spanish

Campo(s) temático(s)
  • Mineralogía
DEF

[Espato] de caliza [...] muy transparente y fuertemente birrefringente.

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