Know all about Chalk and Hornfels properties here. All properties of rocks are important as they define the type of rock and its application. Chalk belongs to Sedimentary Rocks while Hornfels belongs to Metamorphic Rocks.Texture of Chalk is Clastic or Non-Clastic whereas that of Hornfels is Granular, Platy. Chalk appears Soft and Hornfels appears Dull. The luster of Chalk is dull while that of Hornfels is shiny. Chalk is available in grey, white, yellow colors whereas Hornfels is available in brown, dark greenish - grey, green, reddish brown 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 Hornfels are cemetery markers, commemorative tablets, creating artwork.