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