Know all about Greywacke and Jasperoid properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke and Jasperoid belong to Sedimentary Rocks.Texture of Greywacke is Clastic whereas that of Jasperoid is Earthy. Greywacke appears Dull and Jasperoid appears Glassy or Pearly. The luster of Greywacke is dull while that of Jasperoid is vitreous and pearly. Greywacke and Jasperoid 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 Jasperoid are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo).