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Record 1 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

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