Know all about Chalk and Argillite properties here. All properties of rocks are important as they define the type of rock and its application. Chalk and Argillite belong to Sedimentary Rocks.Texture of Chalk is Clastic or Non-Clastic whereas that of Argillite is Clastic, Polished. Chalk appears Soft and Argillite appears Rough and Dull. The luster of Chalk is dull while that of Argillite is waxy and dull. Chalk is available in grey, white, yellow colors whereas Argillite is available in dark grey to black, pink, red, white 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 Argillite are fire resistant, used to manufracture paperweights and bookends.