Know all about Nepheline Syenite and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Nepheline Syenite belongs to Igneous Rocks while Greywacke belongs to Sedimentary Rocks.Texture of Nepheline Syenite is Granular whereas that of Greywacke is Clastic. Nepheline Syenite appears Banded and Foilated and Greywacke appears Dull. The luster of Nepheline Syenite is greasy to dull while that of Greywacke is dull. Nepheline Syenite is available in brown, buff, cream, 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 Nepheline Syenite are cemetery markers, creating artwork and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.