Know all about Phonolite and Gritstone properties here. All properties of rocks are important as they define the type of rock and its application. Phonolite belongs to Igneous Rocks while Gritstone belongs to Sedimentary Rocks.Texture of Phonolite is Granular whereas that of Gritstone is Earthy. Phonolite appears Banded and Foilated and Gritstone appears Layered and Foliated. The luster of Phonolite is greasy to dull while that of Gritstone is dull. Phonolite is available in brown, buff, cream, green, grey, pink, white colors whereas Gritstone is 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 Phonolite are cemetery markers, creating artwork and that 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.