Know all about Greywacke and Hyaloclastite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Hyaloclastite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Hyaloclastite is Pyroclastic. Greywacke appears Dull and Hyaloclastite appears Dull. The luster of Greywacke is dull while that of Hyaloclastite is dull and grainy. Greywacke and Hyaloclastite 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 Hyaloclastite are cemetery markers, creating artwork.