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MACULOSE SCHIST [1 record]

Record 1 2011-12-06

English

Subject field(s)
  • Petrography
DEF

A shaly, slaty, or schistose argillaceous rock the spotted appearance of which is the result of incipient growth of porphyroblasts in response to contact metamorphism of low to medium intensity.

OBS

maculose: Said of a group of contact metamorphic rocks ... that have a spotted ... character ...

OBS

Not to be confused with "knotted schist".

French

Domaine(s)
  • Pétrographie
CONT

La zone des schistes tachetés qui présentent sur un fond gris-fer chloriteux de petites taches noires de 1 mm environ dues à la formation de cordiérite [...]

CONT

Les schistes tachetés et les schistes noduleux présentent respectivement des taches ou des bombements foncés, mesurant de 1 à 10 mm ou davantage, dans lesquels le microscope décèle la présence de silicates spéciaux (andalousite, cordiérite) et de matière charbonneuse.

CONT

[...] schistes tachetés (les taches correspondant à des petits nodules d'un minéral nouveau : la cordiérite); [...]

Spanish

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