Know all about Chert and Chalk properties here. All properties of rocks are important as they define the type of rock and its application. Chert and Chalk belong to Sedimentary Rocks.Texture of Chert is Banded, Rough whereas that of Chalk is Clastic or Non-Clastic. Chert appears Glassy or Pearly and Chalk appears Soft. The luster of Chert is waxy and dull while that of Chalk is dull. Chert is available in black, brown, green, grey, red, white colors whereas Chalk is available in grey, white, yellow colors. The commercial uses of Chert are creating artwork, gemstone, in fire-starting tools, jewelry, to ignite fire, used in flintlock firearms 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.