Know all about Greywacke and Banded iron formation properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke and Banded iron formation belong to Sedimentary Rocks.Texture of Greywacke is Clastic whereas that of Banded iron formation is Banded, Trellis. Greywacke appears Dull and Banded iron formation appears Layered, Banded, Veined and Shiny. The luster of Greywacke is dull while that of Banded iron formation is earthy. 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 Banded iron formation is available in red, reddish brown colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Banded iron formation are as a touchstone, cemetery markers, creating artwork.