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