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