Know all about Gossan and Chalk properties here. All properties of rocks are important as they define the type of rock and its application. Gossan belongs to Metamorphic Rocks while Chalk belongs to Sedimentary Rocks.Texture of Gossan is Rough, Sandy whereas that of Chalk is Clastic or Non-Clastic. Gossan appears Dull and Banded and Chalk appears Soft. The luster of Gossan is metallic while that of Chalk is dull. Gossan is available in brown, brown- black, gold, green, rust colors whereas Chalk is available in grey, white, yellow colors. The commercial uses of Gossan are cemetery markers, commemorative tablets, gemstone and that of Chalk are alumina refineries, creating artwork, drawing on blackboards, gymnasts, athletes and mountain climbers use for grip, in aquifers, paper industry, production of lime, raw material for manufacture of quicklime, slaked lime, soil conditioner, whiting, whiting material in toothpaste, paint and paper.