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