Know all about Trondhjemite and Gritstone properties here. All properties of rocks are important as they define the type of rock and its application. Trondhjemite belongs to Igneous Rocks while Gritstone belongs to Sedimentary Rocks.Texture of Trondhjemite is Phaneritic whereas that of Gritstone is Earthy. Trondhjemite appears Banded and Foilated and Gritstone appears Layered and Foliated. The luster of Trondhjemite is subvitreous to dull while that of Gritstone is dull. Trondhjemite is available in black, brown, light to dark grey, 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 Trondhjemite 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.