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