Know all about Hornfels and Coal properties here. All properties of rocks are important as they define the type of rock and its application. Hornfels belongs to Metamorphic Rocks while Coal belongs to Sedimentary Rocks.Texture of Hornfels is Granular, Platy whereas that of Coal is Amorphous, Glassy. Hornfels appears Dull and Coal appears Veined or Pebbled. The luster of Hornfels is shiny while that of Coal is dull to vitreous to submetallic. Hornfels is available in brown, dark greenish - grey, green, reddish brown colors whereas Coal is available in black, brown, dark brown, grey, light to dark grey colors. The commercial uses of Hornfels are cemetery markers, commemorative tablets, creating artwork and that of Coal are alumina refineries, electricity generation, liquid fuel, manufacture of soap, solvents, dyes, plastics and fibres, paper industry.