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