Know all about Rhyodacite and Nepheline Syenite properties here. All properties of rocks are important as they define the type of rock and its application. Rhyodacite and Nepheline Syenite belong to Igneous Rocks.Texture of Rhyodacite is Earthy whereas that of Nepheline Syenite is Granular. Rhyodacite appears Skeletal and Nepheline Syenite appears Banded and Foilated. The luster of Rhyodacite and Nepheline Syenite is greasy to dull. Rhyodacite is available in black to grey, dark greenish - grey colors whereas Nepheline Syenite is available in brown, buff, cream, green, grey, pink, white colors. The commercial uses of Rhyodacite and Nepheline Syenite are cemetery markers, creating artwork.