Know all about Greywacke and Alkali Feldspar Granite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Alkali Feldspar Granite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Alkali Feldspar Granite is Phaneritic. Greywacke appears Dull and Alkali Feldspar Granite appears Veined or Pebbled. The luster of Greywacke is dull while that of Alkali Feldspar Granite is dull to grainy with sporadic parts pearly and vitreous. 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 Alkali Feldspar Granite is available in black, grey, orange, pink, white colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Alkali Feldspar Granite are curling, gemstone, laboratory bench tops, tombstones.