Know all about Coal and Shonkinite properties here. All properties of rocks are important as they define the type of rock and its application. Coal belongs to Sedimentary Rocks while Shonkinite belongs to Igneous Rocks.Texture of Coal is Amorphous, Glassy whereas that of Shonkinite is Earthy. Coal appears Veined or Pebbled and Shonkinite appears Banded and Foilated. The luster of Coal is dull to vitreous to submetallic while that of Shonkinite is subvitreous to dull. Coal is available in black, brown, dark brown, grey, light to dark grey colors whereas Shonkinite is available in brown, buff, cream, green, grey, 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 Shonkinite are cemetery markers, creating artwork.