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