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