Know all about Greywacke and Diabase properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Diabase belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Diabase is Aphanitic, Granular. Greywacke appears Dull and Diabase appears Vesicular. The luster of Greywacke is dull while that of Diabase is not available. 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 Diabase is available in dark grey to black colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Diabase are an oil and gas reservoir, cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones.