Know all about Greywacke and Lignite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke and Lignite belong to Sedimentary Rocks.Texture of Greywacke is Clastic whereas that of Lignite is Amorphous, Glassy. Greywacke appears Dull and Lignite appears Veined or Pebbled. The luster of Greywacke is dull while that of Lignite is dull to vitreous to submetallic. Greywacke and Lignite are available in beige, black, brown, colourless, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Lignite are electricity generation.