Know all about Coal and Nephelinite properties here. All properties of rocks are important as they define the type of rock and its application. Coal belongs to Sedimentary Rocks while Nephelinite belongs to Igneous Rocks.Texture of Coal is Amorphous, Glassy whereas that of Nephelinite is Aphanitic. Coal appears Veined or Pebbled and Nephelinite appears Skeletal. The luster of Coal is dull to vitreous to submetallic while that of Nephelinite is vitreous to metallic. Coal is available in black, brown, dark brown, grey, light to dark grey colors whereas Nephelinite is available in black, brown, colourless, green, grey, white 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 Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo).