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IRON MAGNESIA MICA [1 record]

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Record 1 2005-08-02

English

Subject field(s)
  • Mineralogy
  • Geochemistry
OBS

ferromagnesian: Containing iron and magnesium.

French

Domaine(s)
  • Minéralogie
  • Géochimie
DEF

Mica renfermant du fer et du magnésium dans des proportions variables.

CONT

La biotite appartient au groupe des micas ferromagnésiens et se présente en cristaux monocliniques pseudohexagonaux de couleur brun-noir rougêatre. [...] Certaines [biotites] contiennent peu de magnésium, d'autres sont riches en fer trivalent [...]

Spanish

Campo(s) temático(s)
  • Mineralogía
  • Geoquímica
CONT

Las micas ferromagnésicas o negras contienen además, como su nombre lo indica, hierro o magnesio, o los dos a la vez. Son de color muy oscuro, generalmente pardo. Entre ellas figuran las siguientes: biotita, flogopita, lepidolita, zinnwaldita, etc.

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