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