Know all about Lignite and Variolite properties here. All properties of rocks are important as they define the type of rock and its application. Lignite belongs to Sedimentary Rocks while Variolite belongs to Igneous Rocks.Texture of Lignite is Amorphous, Glassy whereas that of Variolite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular. Lignite appears Veined or Pebbled and Variolite appears Dull and Soft. The luster of Lignite is dull to vitreous to submetallic while that of Variolite is not available. Lignite and Variolite are available in black, brown, dark brown, grey, light to dark grey colors. The commercial uses of Lignite are electricity generation and that of Variolite are cemetery markers, creating artwork.