Know all about Troctolite and Coal properties here. All properties of rocks are important as they define the type of rock and its application. Troctolite belongs to Igneous Rocks while Coal belongs to Sedimentary Rocks.Texture of Troctolite is Phaneritic whereas that of Coal is Amorphous, Glassy. Troctolite appears Veined and Shiny and Coal appears Veined or Pebbled. The luster of Troctolite is not available while that of Coal is dull to vitreous to submetallic. Troctolite 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 Troctolite are cemetery markers, commemorative tablets, 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.