Know all about Coal and Scoria properties here. All properties of rocks are important as they define the type of rock and its application. Coal belongs to Sedimentary Rocks while Scoria belongs to Igneous Rocks.Texture of Coal is Amorphous, Glassy whereas that of Scoria is Vesicular. Coal appears Veined or Pebbled and Scoria appears Glassy and Vesicular. The luster of Coal is dull to vitreous to submetallic while that of Scoria is subvitreous to dull. Coal is available in black, brown, dark brown, grey, light to dark grey colors whereas Scoria is available in black, brown, dark grey to black, red 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 Scoria are as a traction material on snow-covered roads, creating artwork, high-temperature insulation, in gas barbecue grills.