ardoise -> slate


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ardoise -> slate

L'ardoise est une roche métamorphique qui s'est formée dans de fortes conditions de pression et de température. Elle appartient à la famille des schistes dont elle se distingue par la qualité de son grain, très fin, et sa fissilité. Ces propriétés font qu'on peut l'utiliser comme matériau de couverture.

Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic  ash through low-grade regional metamorphism. The result is a foliated rock in which the foliation may not correspond to the original sedimentary layering. Slate is frequently grey in color, especially when seen en masse covering roofs. However, slate occurs in a variety of colors even from a single locality. For example slate from North Wales can be found in many shades of grey from pale to dark and may also be purple, green or cyan.
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