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