Know all about Theralite and Obsidian properties here. All properties of rocks are important as they define the type of rock and its application. Theralite and Obsidian belong to Igneous Rocks.Texture of Theralite is Phaneritic whereas that of Obsidian is Glassy. Theralite appears Veined and Shiny and Obsidian appears Shiny. The luster of Theralite is waxy and dull while that of Obsidian is vitreous. Theralite is available in dark grey to black colors whereas Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Theralite are cemetery markers, commemorative tablets, creating artwork, laboratory bench tops, jewelry, sea defence, tombstones and that of Obsidian are creating artwork, mirror, used in aquariums.