Know all about Slate and Lignite properties here. All properties of rocks are important as they define the type of rock and its application. Slate belongs to Metamorphic Rocks while Lignite belongs to Sedimentary Rocks.Texture of Slate is Foliated whereas that of Lignite is Amorphous, Glassy. Slate appears Dull and Lignite appears Veined or Pebbled. The luster of Slate is dull while that of Lignite is dull to vitreous to submetallic. Slate is available in black, brown, buff, green, light to dark grey, purple, red, shades of blue colors whereas Lignite is available in black, brown, dark brown, grey, light to dark grey colors. The commercial uses of Slate are blackboards, commemorative tablets, laboratory bench tops, standard material for the bed of billiard table, standard material for the beds of pool and snooker table, tombstones, used in aquariums, writing slates and that of Lignite are electricity generation.