Know all about Granite and Obsidian properties here. All properties of rocks are important as they define the type of rock and its application. Granite and Obsidian belong to Igneous Rocks.Texture of Granite is Granular, Phaneritic whereas that of Obsidian is Glassy. Granite appears Veined or Pebbled and Obsidian appears Shiny. The luster of Granite is dull to grainy with sporadic parts pearly and vitreous while that of Obsidian is vitreous. Granite is available in black, grey, orange, pink, white colors whereas Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Granite are curling, gemstone, laboratory bench tops, tombstones, used in aquariums and that of Obsidian are creating artwork, mirror, used in aquariums.