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