Sandstone
Normally has a rough riven textured surface. However some Indian Sandstone is sawn and honed, so are smooth on the surface. Although harder than limestone, it has a similar absorbency. Colour ranges from red, beige, brown, green to grey. Well known sandstones include Yorkstone, Fossil Stone, Raj Green and Rainbow. Porosity Test: May vary between 1 minute and 1 hour.