Know all about Gritstone and Foidolite properties here. All properties of rocks are important as they define the type of rock and its application. Gritstone belongs to Sedimentary Rocks while Foidolite belongs to Igneous Rocks.Texture of Gritstone is Earthy whereas that of Foidolite is Earthy. Gritstone appears Layered and Foliated and Foidolite appears Dull. The luster of Gritstone is dull while that of Foidolite is subvitreous to dull. Gritstone and Foidolite 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 Foidolite are cemetery markers, commemorative tablets, creating artwork.