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