Know all about Flint and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Flint and Greywacke belong to Sedimentary Rocks.Texture of Flint is Banded, Rough whereas that of Greywacke is Clastic. Flint appears Glassy or Pearly and Greywacke appears Dull. The luster of Flint is vitreous while that of Greywacke is dull. Flint is available in black, brown, green, grey, red, white colors whereas Greywacke is 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 Flint are creating artwork, gemstone, in fire-starting tools, manufacture of tools, metallurgical flux, jewelry, to ignite fire, used in flintlock firearms and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.