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