Know all about Porphyry and Obsidian properties here. All properties of rocks are important as they define the type of rock and its application. Porphyry and Obsidian belong to Igneous Rocks.Texture of Porphyry is Porphyritic whereas that of Obsidian is Glassy. Porphyry appears Dull and Obsidian appears Shiny. The luster of Porphyry is dull while that of Obsidian is vitreous. Porphyry is available in black, brown, colourless, green, grey, red, rust, white colors whereas Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Porphyry are creating artwork, gemstone, jewelry and that of Obsidian are creating artwork, mirror, used in aquariums.