Slate Slate 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. It is the finest grained foliated metamorphic rock. Foliation may not correspond to the original sedimentary layering, but instead is in planes perpendicular to the direction of metamorphic compression. The foliation in slate is called "slaty cleavage". It is caused by strong compression causing fine grained clay flakes to regrow in planes perpendicular to the compression. When expertly "cut" by striking parallel to the foliation, with a specialized tool in the quarry, many slates
Name of France suburbs. This fourth meaning is found in many place names, such as the town of Roissy-en-France, on whose territory is located Charles de Gaulle Airport. The name of the town literally means "Roissy in the "Pays de France"", and not "Roissy in the country France". Another example of the use of France in this meaning is the new "Stade de France", which was built near Saint-Denis for the 1998 Football World Cup. It was decided to call the stadium after the "Pays de France", to give it a local touch. In particular, the mayor of Saint-Denis made it very clear