Know all about Lignite and Argillite properties here. All properties of rocks are important as they define the type of rock and its application. Lignite and Argillite belong to Sedimentary Rocks.Texture of Lignite is Amorphous, Glassy whereas that of Argillite is Clastic, Polished. Lignite appears Veined or Pebbled and Argillite appears Rough and Dull. The luster of Lignite is dull to vitreous to submetallic while that of Argillite is waxy and dull. Lignite is available in black, brown, dark brown, grey, light to dark grey colors whereas Argillite is available in dark grey to black, pink, red, white colors. The commercial uses of Lignite are electricity generation and that of Argillite are fire resistant, used to manufracture paperweights and bookends.