Slates are fine grained metamorphic stone that is formed from clay, sedimentary rock shell, and sometimes quartz. Characteristically the rock may slit into relatively thinner slabs. Slates find application in interiors and exteriors. It is extremely beautiful and more cost effective than most other wall and floor coverings. It renders a very graceful, natural finish to any building or home. The usual colours of slate are copper, gold, multicolor, black, dark grey, greenish grey, copper and purplish grey. Sometimes colour changes do occur due to weathering. Slate has an excellent shining property.