Know all about Greywacke and Blue 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 Blue Granite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Blue Granite is Phaneritic. Greywacke appears Dull and Blue Granite appears Shiny. The luster of Greywacke is dull while that of Blue Granite is subvitreous to dull. Greywacke and Blue Granite 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 Blue Granite are cemetery markers, commemorative tablets, creating artwork, curling.