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