Know all about Gritstone and Skarn properties here. All properties of rocks are important as they define the type of rock and its application. Gritstone belongs to Sedimentary Rocks while Skarn belongs to Metamorphic Rocks.Texture of Gritstone is Earthy whereas that of Skarn is Earthy, Mud-rich, Rough. Gritstone appears Layered and Foliated and Skarn appears Dull. The luster of Gritstone is dull while that of Skarn is waxy and dull. Gritstone and Skarn are available in beige, black, brown, colourless, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors. The commercial uses of Gritstone are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo), tombstones and that of Skarn are creating artwork, gemstone, jewelry, metallurgical flux, source of magnesia (mgo).