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