Know all about Chalk and Comendite properties here. All properties of rocks are important as they define the type of rock and its application. Chalk belongs to Sedimentary Rocks while Comendite belongs to Igneous Rocks.Texture of Chalk is Clastic or Non-Clastic whereas that of Comendite is Porphyritic. Chalk appears Soft and Comendite appears Foliated. The luster of Chalk and Comendite is dull. Chalk is available in grey, white, yellow colors whereas Comendite is available in blue, bluish - grey 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 Comendite are cemetery markers.