Know all about Coal and Luxullianite properties here. All properties of rocks are important as they define the type of rock and its application. Coal belongs to Sedimentary Rocks while Luxullianite belongs to Igneous Rocks.Texture of Coal is Amorphous, Glassy whereas that of Luxullianite is Granular, Phaneritic. Coal appears Veined or Pebbled and Luxullianite appears Veined or Pebbled. The luster of Coal is dull to vitreous to submetallic while that of Luxullianite is dull to grainy with sporadic parts pearly and vitreous. Coal is available in black, brown, dark brown, grey, light to dark grey colors whereas Luxullianite is available in black, grey, orange, pink, white 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 Luxullianite are creating artwork, curling, gemstone, laboratory bench tops, tombstones.