• Is a Metamorphic rock
  • formed by regional metamorphism of argillaceous sediments since their cleavage arose due to deviatoric stress.
  • Contains Albite, Alusite, Biotite, Chlorite, Feldspar, Garnet, Graphite, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz etc.
  • Used as decorative stones in counter tops, floor tiles etc.