Know all about Coal and Alkali Feldspar Granite properties here. All properties of rocks are important as they define the type of rock and its application. Coal belongs to Sedimentary Rocks while Alkali Feldspar Granite belongs to Igneous Rocks.Texture of Coal is Amorphous, Glassy whereas that of Alkali Feldspar Granite is Phaneritic. Coal appears Veined or Pebbled and Alkali Feldspar Granite appears Veined or Pebbled. The luster of Coal is dull to vitreous to submetallic while that of Alkali Feldspar Granite is dull to grainy with sporadic parts pearly and vitreous. Coal is available in black, brown, dark brown, grey, light to dark grey colors whereas Alkali Feldspar Granite is available in black, grey, orange, pink, 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 Alkali Feldspar Granite are curling, gemstone, laboratory bench tops, tombstones.