Know all about Gossan and Siltstone properties here. All properties of rocks are important as they define the type of rock and its application. Gossan belongs to Metamorphic Rocks while Siltstone belongs to Sedimentary Rocks.Texture of Gossan is Rough, Sandy whereas that of Siltstone is Clastic. Gossan appears Dull and Banded and Siltstone appears Rough. The luster of Gossan is metallic while that of Siltstone is dull. Gossan is available in brown, brown- black, gold, green, rust colors whereas Siltstone is available in brown, red, reddish brown colors. The commercial uses of Gossan are cemetery markers, commemorative tablets, gemstone and that of Siltstone are raw material for the manufacture of mortar, soil conditioner.