Know all about Greywacke and Adakite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Adakite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Adakite is Porphyritic. Greywacke appears Dull and Adakite appears Dull and Soft. The luster of Greywacke is dull while that of Adakite is grainy, pearly and vitreous. Greywacke and Adakite 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 Adakite are commemorative tablets, pottery, used in aquariums.