Know all about Lignite and Tuff properties here. All properties of rocks are important as they define the type of rock and its application. Lignite belongs to Sedimentary Rocks while Tuff belongs to Igneous Rocks.Texture of Lignite is Amorphous, Glassy whereas that of Tuff is Clastic, Pyroclastic. Lignite appears Veined or Pebbled and Tuff appears Dull, Vesicular and Foilated. The luster of Lignite is dull to vitreous to submetallic while that of Tuff is vitreous to dull. Lignite is available in black, brown, dark brown, grey, light to dark grey colors whereas Tuff is available in brown, grey, yellow colors. The commercial uses of Lignite are electricity generation and that of Tuff are creating artwork.