SLATE is a fine-grained rock of sedimentary derivation, with a slight metamorphism, characterized by presenting a perfect clivage, making it possible to form big plates of few millimeters of thickness, with a solid flat surface.
It is mainly made of quartz, white mica, chlorite, feldspar, carbonate and iron oxide.
Its physical properties, such as preferential clivage, medium hardness, low porosity, high mechanic resistance, component minerals resistant to open air, etc. , allow its ample use as coating, therefore being used in varied areas of civil construction and engineering.
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