Know all about Greywacke and Trondhjemite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Trondhjemite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Trondhjemite is Phaneritic. Greywacke appears Dull and Trondhjemite appears Banded and Foilated. The luster of Greywacke is dull while that of Trondhjemite is subvitreous to dull. Greywacke and Trondhjemite 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 Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Trondhjemite are cemetery markers, creating artwork.