Know all about Gossan and Rhyodacite properties here. All properties of rocks are important as they define the type of rock and its application. Gossan belongs to Metamorphic Rocks while Rhyodacite belongs to Igneous Rocks.Texture of Gossan is Rough, Sandy whereas that of Rhyodacite is Earthy. Gossan appears Dull and Banded and Rhyodacite appears Skeletal. The luster of Gossan is metallic while that of Rhyodacite is greasy to dull. Gossan is available in brown, brown- black, gold, green, rust colors whereas Rhyodacite is available in black to grey, dark greenish - grey colors. The commercial uses of Gossan are cemetery markers, commemorative tablets, gemstone and that of Rhyodacite are cemetery markers, creating artwork.