Know all about Greywacke and Ganister properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke and Ganister belong to Sedimentary Rocks.Texture of Greywacke is Clastic whereas that of Ganister is Clastic, Granular, Rough. Greywacke appears Dull and Ganister appears Rough. The luster of Greywacke and Ganister is dull. Greywacke and Ganister 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 Ganister are an oil and gas reservoir, in aquifers, petroleum reservoirs, soil conditioner, source of magnesia (mgo), tombstones.