Know all about Coal and Pseudotachylite properties here. All properties of rocks are important as they define the type of rock and its application. Coal belongs to Sedimentary Rocks while Pseudotachylite belongs to Metamorphic Rocks.Texture of Coal is Amorphous, Glassy whereas that of Pseudotachylite is Quench. Coal appears Veined or Pebbled and Pseudotachylite appears Dull and Soft. The luster of Coal is dull to vitreous to submetallic while that of Pseudotachylite is vitreous. Coal is available in black, brown, dark brown, grey, light to dark grey colors whereas Pseudotachylite is available in black, brown, colourless, green, grey, 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 Pseudotachylite are creating artwork, gemstone.