Slate is one of the metamorphic rocks, with layered and banded appearance due to the alteration by heat and pressure. Slate comprises mainly clay minerals, mica, quartz and small percentages of calcite, feldspar. Typically available in grey colour, slates are also offered in the hues of green, red, black, brown due to presence of iron and organic minerals. It is mined throughout the world for roofing purpose. Thin layers of sheet, low absorption rate, withstanding extreme climate conditions make it a perfect choice. It can also be used as dimension stone, interior flooring and decorative purposes.