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NIGGLI NORM [1 record]

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Record 1 1997-11-18

English

Subject field(s)
  • Petrography
  • Mineralogy
DEF

A norm in which the reported content of a mineral represents the percentage of the total cations present in the rock that are tied up in that particular mineral.

OBS

Three variant mineral associations are possible: the catanorm, the mesonorm and the epinorm.

French

Domaine(s)
  • Pétrographie
  • Minéralogie
CONT

[La composition minéralogique théorique d'une roche magmatique] [...] est calculée [...] selon des règles strictes : soit celles de Cross, Iddings, Pirsson, et Washington (norme CIWP), soit celles de Niggli (norme moléculaire de Niggli).

Key term(s)
  • norme de Niggli

Spanish

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