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MELANO [1 record]

Record 1 2017-05-11

English

Subject field(s)
  • Petrography
DEF

Applied to an igneous rock rich in dark-colored or mafic minerals.

OBS

As opposed to "leucocratic."

OBS

The prefix "melano-", meaning "dark-colored" is often used before a name of rock, e.g., melanogabbro.

Key term(s)
  • melano

French

Domaine(s)
  • Pétrographie
DEF

S'applique aux roches riches en minéraux ferromagnésiens souvent de couleur noire.

CONT

La proportion des minéraux foncés, facilement appréciable au coup d'œil, fournit une classification abrégée [des roches ignées], mais évidemment moins précise. On distingue les groupes suivants. [...] Roches mélanocrates 65 à 95 [% de minéraux foncés.]

OBS

mélano- : Préfixe couramment utilisé devant des noms de roches mélanocrates. Ex. : mélanogabbro.

OBS

S'oppose à «leucocrate».

OBS

mélanocratique : calque de l'anglais «melanocratic».

Key term(s)
  • mélano

Spanish

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