Know all about Obsidian and Granulite properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian belongs to Igneous Rocks while Granulite belongs to Metamorphic Rocks.Texture of Obsidian is Glassy whereas that of Granulite is Granoblastic. Obsidian appears Shiny and Granulite appears Veined or Pebbled. The luster of Obsidian and Granulite is vitreous. Obsidian and Granulite are available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Obsidian are creating artwork, mirror, used in aquariums and that of Granulite are curling, gemstone, laboratory bench tops, soil conditioner, tombstones.