Know all about Lignite and Picrite properties here. All properties of rocks are important as they define the type of rock and its application. Lignite belongs to Sedimentary Rocks while Picrite belongs to Igneous Rocks.Texture of Lignite is Amorphous, Glassy whereas that of Picrite is Earthy, Rough. Lignite appears Veined or Pebbled and Picrite appears Rough and Shiny. The luster of Lignite is dull to vitreous to submetallic while that of Picrite is subvitreous to dull. Lignite is available in black, brown, dark brown, grey, light to dark grey colors whereas Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors. The commercial uses of Lignite are electricity generation and that of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo).