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