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