Know all about Gossan and Rhyolite properties here. All properties of rocks are important as they define the type of rock and its application. Gossan belongs to Metamorphic Rocks while Rhyolite belongs to Igneous Rocks.Texture of Gossan is Rough, Sandy whereas that of Rhyolite is Aphanitic, Glassy, Porphyritic. Gossan appears Dull and Banded and Rhyolite appears Banded. The luster of Gossan is metallic while that of Rhyolite is earthy. Gossan is available in brown, brown- black, gold, green, rust colors whereas Rhyolite is available in grey, white, light black colors. The commercial uses of Gossan are cemetery markers, commemorative tablets, gemstone and that of Rhyolite are gemstone, laboratory bench tops, jewelry.