Know all about Coal and Claystone properties here. All properties of rocks are important as they define the type of rock and its application. Coal and Claystone belong to Sedimentary Rocks.Texture of Coal is Amorphous, Glassy whereas that of Claystone is Clastic. Coal appears Veined or Pebbled and Claystone appears Rough and Dull. The luster of Coal is dull to vitreous to submetallic while that of Claystone is dull. Coal is available in black, brown, dark brown, grey, light to dark grey colors whereas Claystone is available in black, blue, brown, green, grey, orange, red, white, yellow colors. The commercial uses of Coal are alumina refineries, electricity generation, liquid fuel, manufacture of soap, solvents, dyes, plastics and fibres, paper industry and that of Claystone are pottery.