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