Know all about Foidolite and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Foidolite belongs to Igneous Rocks while Greywacke belongs to Sedimentary Rocks.Texture of Foidolite is Earthy whereas that of Greywacke is Clastic. Foidolite appears Dull and Greywacke appears Dull. The luster of Foidolite is subvitreous to dull while that of Greywacke is dull. Foidolite is available in black, brown, colourless, green, grey, pink, 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 Foidolite are cemetery markers, commemorative tablets, creating artwork and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.