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MACLE CARLSBAD [1 record]

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Record 1 1999-10-01

English

Subject field(s)
  • Mineralogy
DEF

A twinned crystal in which the twinning axis is the c axis, the operation is a rotation of 180 degrees, and the contact surface is parallel to the side pinacoid; common in the alkali feldspars.

French

Domaine(s)
  • Minéralogie
CONT

Les feldspaths alcalins [...] forment des cristaux [...] réguliers présentant la macle de Carlsbad : le cristal est alternativement brillant et terne par moitié, suivant l'éclairage.

CONT

L'orthose est parfois un minéral qui paraît être dû à l'apparente interpénétration de 2 cristaux monocliniques orientés à 180° l'un par rapport à l'autre, c'est la macle de Carlsbad [...]

CONT

Les orthoses sont souvent maclées; parmi les plus courantes nous pourrons signaler la macle de Carlsbad [...] c'est une macle par pénétration.

Spanish

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