Know all about Obsidian and Skarn properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian belongs to Igneous Rocks while Skarn belongs to Metamorphic Rocks.Texture of Obsidian is Glassy whereas that of Skarn is Earthy, Mud-rich, Rough. Obsidian appears Shiny and Skarn appears Dull. The luster of Obsidian is vitreous while that of Skarn is waxy and dull. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Skarn is available in black, brown, colourless, green, grey, white colors. The commercial uses of Obsidian are creating artwork, mirror, used in aquariums and that of Skarn are creating artwork, gemstone, jewelry, metallurgical flux, source of magnesia (mgo).