Know all about Basalt and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Basalt belongs to Igneous Rocks while Greywacke belongs to Sedimentary Rocks.Texture of Basalt is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Greywacke is Clastic. Basalt appears Dull and Soft and Greywacke appears Dull. The luster of Basalt is not available while that of Greywacke is dull. Basalt is available in black, brown, light to dark grey colors whereas Greywacke 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 Basalt are an oil and gas reservoir, commemorative tablets, creating artwork, used in aquariums and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.