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ANGLE EXTINCTION [1 record]

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Alphabetical list of terms

Record 1 1977-11-11

English

Subject field(s)
  • Mineralogy
DEF

The angle through which a section of a birefringent mineral must be rotated from a known crystallographic plane or direction to the position at which it gives maximum "extinction" or darkness under a polarizing microscope. The extinction angle can be diagnostic in the identification of a particular crystal.

French

Domaine(s)
  • Minéralogie
CONT

On verra, à propos de chacun des groupes de minéraux des roches, les repères adoptés pour la mesure des "angles d'extinction" (...)

Spanish

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