Know all about Greywacke and Rapakivi 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 Rapakivi Granite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Rapakivi Granite is Granular, Phaneritic. Greywacke appears Dull and Rapakivi Granite appears Veined or Pebbled. The luster of Greywacke is dull while that of Rapakivi 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 Rapakivi 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 Rapakivi Granite are cemetery markers, commemorative tablets, creating artwork, curling, laboratory bench tops, tombstones.