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