Know all about Theralite and Coal properties here. All properties of rocks are important as they define the type of rock and its application. Theralite belongs to Igneous Rocks while Coal belongs to Sedimentary Rocks.Texture of Theralite is Phaneritic whereas that of Coal is Amorphous, Glassy. Theralite appears Veined and Shiny and Coal appears Veined or Pebbled. The luster of Theralite is waxy and dull while that of Coal is dull to vitreous to submetallic. Theralite is available in dark grey to black colors whereas Coal is available in black, brown, dark brown, grey, light to dark grey colors. The commercial uses of Theralite are cemetery markers, commemorative tablets, creating artwork, laboratory bench tops, jewelry, sea defence, tombstones and that of Coal are alumina refineries, electricity generation, liquid fuel, manufacture of soap, solvents, dyes, plastics and fibres, paper industry.