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