Know all about Chalk and Gossan properties here. All properties of rocks are important as they define the type of rock and its application. Chalk belongs to Sedimentary Rocks while Gossan belongs to Metamorphic Rocks.Texture of Chalk is Clastic or Non-Clastic whereas that of Gossan is Rough, Sandy. Chalk appears Soft and Gossan appears Dull and Banded. The luster of Chalk is dull while that of Gossan is metallic. Chalk is available in grey, white, yellow colors whereas Gossan is available in brown, brown- black, gold, green, rust colors. The commercial uses 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 and that of Gossan are cemetery markers, commemorative tablets, gemstone.