Know all about Lignite and Porphyry properties here. All properties of rocks are important as they define the type of rock and its application. Lignite belongs to Sedimentary Rocks while Porphyry belongs to Igneous Rocks.Texture of Lignite is Amorphous, Glassy whereas that of Porphyry is Porphyritic. Lignite appears Veined or Pebbled and Porphyry appears Dull. The luster of Lignite is dull to vitreous to submetallic while that of Porphyry is dull. Lignite is available in black, brown, dark brown, grey, light to dark grey colors whereas Porphyry is available in black, brown, colourless, green, grey, red, rust, white colors. The commercial uses of Lignite are electricity generation and that of Porphyry are creating artwork, gemstone, jewelry.