Know all about Coal and Dacite properties here. All properties of rocks are important as they define the type of rock and its application. Coal belongs to Sedimentary Rocks while Dacite belongs to Igneous Rocks.Texture of Coal is Amorphous, Glassy whereas that of Dacite is Aphanitic to Porphyritic. Coal appears Veined or Pebbled and Dacite appears Vesicular. The luster of Coal is dull to vitreous to submetallic while that of Dacite is subvitreous to dull. Coal is available in black, brown, dark brown, grey, light to dark grey colors whereas Dacite is available in bluish - grey, brown, grey, light to dark grey 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 Dacite are commemorative tablets, creating artwork.