Know all about Rhyolite and Coal properties here. All properties of rocks are important as they define the type of rock and its application. Rhyolite belongs to Igneous Rocks while Coal belongs to Sedimentary Rocks.Texture of Rhyolite is Aphanitic, Glassy, Porphyritic whereas that of Coal is Amorphous, Glassy. Rhyolite appears Banded and Coal appears Veined or Pebbled. The luster of Rhyolite is earthy while that of Coal is dull to vitreous to submetallic. Rhyolite is available in grey, white, light black colors whereas Coal is available in black, brown, dark brown, grey, light to dark grey colors. The commercial uses of Rhyolite are gemstone, laboratory bench tops, jewelry and that of Coal are alumina refineries, electricity generation, liquid fuel, manufacture of soap, solvents, dyes, plastics and fibres, paper industry.