Know all about Greywacke and Dacite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Dacite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Dacite is Aphanitic to Porphyritic. Greywacke appears Dull and Dacite appears Vesicular. The luster of Greywacke is dull while that of Dacite is subvitreous to dull. Greywacke is available in beige, black, brown, colourless, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors whereas Dacite is available in bluish - grey, brown, grey, light to dark grey colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Dacite are commemorative tablets, creating artwork.