Slate
Slate is a sedimentary derivation rock with fine granulation, weakly metamorphized, characterised by perfect cleavage, thus being able to form big sheets of just a few millimetres in thickness, in a continuous flat surface. It is composed mainly by quartz, white mica, chlorite, feldspat, carbonate and iron oxide. Slate is commonly used for flooring, but decorative walls are also very popular (especially stack-up tiles).
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