Know all about Dacite and Coal properties here. All properties of rocks are important as they define the type of rock and its application. Dacite belongs to Igneous Rocks while Coal belongs to Sedimentary Rocks.Texture of Dacite is Aphanitic to Porphyritic whereas that of Coal is Amorphous, Glassy. Dacite appears Vesicular and Coal appears Veined or Pebbled. The luster of Dacite is subvitreous to dull while that of Coal is dull to vitreous to submetallic. Dacite is available in bluish - grey, brown, grey, light to dark grey colors whereas Coal is available in black, brown, dark brown, grey, light to dark grey colors. The commercial uses of Dacite are commemorative tablets, creating artwork and that of Coal are alumina refineries, electricity generation, liquid fuel, manufacture of soap, solvents, dyes, plastics and fibres, paper industry.