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CROSSED NICOLS [5 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2012-04-13

English

Subject field(s)
  • Mineralogy
DEF

... a silicate mineral ... known to crystallize in the triclinic system of crystal formation.

CONT

Gyrolite is most commonly found white or colourless in appearance. In optical mineralogy, colourless sections of any mineral allow the whole constituent of the white light to pass through making the mineral non-pleochroic between crossed nicols of polarizing microscopes.... Gyrolite is most commonly found exhibiting vitreous to dull luster when viewed in reflected light of [a] polarizing light microscope.

French

Domaine(s)
  • Minéralogie
DEF

Minéral (silicate) du système cristallin triclinique pseudo-hexagonal, incolore ou blanc, éclat vitreux.

Spanish

Campo(s) temático(s)
  • Mineralogía
DEF

Silicato hidratado de calcio y magnesio [...], que cristaliza en el sistema rómbico.

Save record 1

Record 2 2011-09-09

English

Subject field(s)
  • Optics
  • Mineralogy
DEF

A pair of Nicol prisms whose principal planes are perpendicular to each other, so that light passing through one is extinguished by the other.

CONT

The overall appearance of the horizon under crossed nicols is almost isotic.

OBS

crossed nicols :Nicols is often capitalized(crossed Nicols)

French

Domaine(s)
  • Optique
  • Minéralogie
CONT

Si ces plans de vibration sont perpendiculaires (nicols croisés) aucune lumière ne franchit l'analyseur.

CONT

[...] l'examen de lames minces d'adulaire, au microscope en lumière polarisée entre nicols croisés, révèle un comportement optique beaucoup plus complexe que l'orthose normal.

OBS

Par opposition à «nicols parallèles».

Spanish

Save record 2

Record 3 1996-04-03

English

Subject field(s)
  • Optics
  • Mineralogy
OBS

As opposed to "crossed nicols"(see record).

French

Domaine(s)
  • Optique
  • Minéralogie
OBS

Par opposition à «nicols croisés».

Spanish

Save record 3

Record 4 1978-04-14

English

Subject field(s)
  • Mineralogy
OBS

If illuminated with white light, plates of anisotropic crystals viewed(off extinction) between crossed or parallel nicols will appear colored. These colors, known as interference colors, result from the unequal transmission by the analyzer of the component wavelengths of the white light.

French

Domaine(s)
  • Minéralogie
OBS

"Les corps des systèmes autres que le système cubique agissent sur la lumière polarisée": ils la décomposent en deux rayons vibrant dans deux plans perpendiculaires, mais que le nicol analipeur amène à vibrer dans le même plan. Les deux vibrations peuvent alors interférer: pour la lumière du jours certaines couleurs s'annulent alors, les autres se combinent en une couleur composée et la plaque mince apparaît colorée: on a des "teintes de polarisation".

Spanish

Save record 4

Record 5 1977-11-11

English

Subject field(s)
  • Mineralogy
OBS

One of the two positions at which a section of a birefringent crystal shows "extinction" between crossed nicols.

French

Domaine(s)
  • Minéralogie
OBS

Lorsque les sections des minéraux présentent des caractères cristallographiques apparents (faces cristallines, clivages, macles), on détermine l'orientation des "directions d'extinction", c'est-à-dire des indices n'g et n'p, par rapport à certains de ces repères cristallographiques choisis en conséquence.

Spanish

Save record 5

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