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Slate is a very fine grained metamorphic rock derived from the sedimentary rock 'shale'. Slate is composed mostly of mica, chlorite and quartz. Shale stone is made up of silt and clay that is similar in composition to sandstone except that the particle size is much smaller. Shale is subjected to heat and pressure and the fine particles are "melted" together to form slate. Slate is characterized by a sub parallel orientation which imparts a strong parallel cleavage to the rock which allows the slate rock to be split into thin but tough sheets of slate. Slate is generally used in the form of tiles. Slate is compact and has a moderate hardness and lesser homogeneity. Slate has a fine to medium grained surface texture. Slate has an excellent shining property. Slate is a popular ornamental and decorative stone because of the pleasing colors, attractive patterns and designs. Slate tiles are used for wall cladding, roofing and flooring. Slate is suitable for Exterior and Interior Applications. India is an important producer of slate. The leading Indian slate exporters are listed here
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板岩