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LEFT-HANDED QUARTZ [5 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2005-01-28

English

Subject field(s)
  • Mineralogy
DEF

A crystallographic term applied to forms which are similar but not congruent, i.e. cannot be superimposed even by rotation and/or inversion.

CONT

Enantiomorphic forms are mirror-images of one another, and are generally referred to as being left-handed or right-handed. Quartz crystals are an example.

French

Domaine(s)
  • Minéralogie
DEF

Se dit de cristaux qui ne sont pas superposables, mais qui sont images l'un de l'autre dans un miroir.

CONT

Hémiédrie plagiaire [...] ou hémiédrie énantiomorphe [...] caractérisée par l'absence de centre et de plan de symétrie [...] Dans ces conditions, le polyèdre obtenu n'est plus superposable à son image reflétée par un miroir. Il peut exister deux formes - dites droites et gauches [...]

Spanish

Campo(s) temático(s)
  • Mineralogía
DEF

Que tiene la misma forma aunque invertida [...]

Save record 1

Record 2 1997-03-12

English

Subject field(s)
  • Mineralogy
  • Optics
DEF

The four-rayed spiral curve that appears when sections of right-handed and left-handed quartz crystals are placed together between crossed polarizers.

French

Domaine(s)
  • Minéralogie
  • Optique
DEF

[...] phénomène de polarisation rotatoire, qui se produit lorsqu'on observe, entre deux tourmalines croisées, deux lames de quartz de même épaisseur, mais de rotation inverse.

OBS

Généralement usité au pluriel d'après la source DCHIM.

Key term(s)
  • spirales d'Airy

Spanish

Save record 2

Record 3 1991-01-31

English

Subject field(s)
  • Mineralogy
CONT

enantiomorphism : The characteristic of two crystals to be mirror images of each other, e. g. right-handed and left-handed quartz.

French

Domaine(s)
  • Minéralogie
CONT

Faces vicinales du quartz droit et du quartz gauche.

Spanish

Save record 3

Record 4 1991-01-31

English

Subject field(s)
  • Mineralogy
CONT

enantiomorphism : The characteristic of two crystals to be mirror images of each other, e. g. right-handed and left-handed quartz.

French

Domaine(s)
  • Minéralogie
CONT

Faces vicinales du quartz droit et du quartz gauche.

Spanish

Save record 4

Record 5 1991-01-31

English

Subject field(s)
  • Mineralogy
DEF

The characteristic of two crystals to be mirror images of each other, e. g. right-handed and left-handed quartz.

CONT

Enantiomorphism is produced by the improper crystallographic operations of reflection across a plane and inversion through a point.

French

Domaine(s)
  • Minéralogie
DEF

Caractère de deux cristaux énantiomorphes.

Spanish

Save record 5

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