Know all about Gneiss and Rhyodacite properties here. All properties of rocks are important as they define the type of rock and its application. Gneiss belongs to Metamorphic Rocks while Rhyodacite belongs to Igneous Rocks.Texture of Gneiss is Banded, Foliated, Platy whereas that of Rhyodacite is Earthy. Gneiss appears Foliated and Rhyodacite appears Skeletal. The luster of Gneiss is dull while that of Rhyodacite is greasy to dull. Gneiss is available in black, brown, pink, red, white colors whereas Rhyodacite is available in black to grey, dark greenish - grey colors. The commercial uses of Gneiss are cemetery markers, jewelry, tombstones, used in aquariums and that of Rhyodacite are cemetery markers, creating artwork.