Know all about Greywacke and Hawaiite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Hawaiite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Hawaiite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular. Greywacke appears Dull and Hawaiite appears Dull and Soft. The luster of Greywacke is dull while that of Hawaiite is not available. Greywacke and Hawaiite 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 Hawaiite are creating artwork, sea defence.