Know all about Chalk and Greenschist properties here. All properties of rocks are important as they define the type of rock and its application. Chalk belongs to Sedimentary Rocks while Greenschist belongs to Metamorphic Rocks.Texture of Chalk is Clastic or Non-Clastic whereas that of Greenschist is Foliated, Platy. Chalk appears Soft and Greenschist appears Layered and Shiny. The luster of Chalk is dull while that of Greenschist is shiny. Chalk is available in grey, white, yellow colors whereas Greenschist is available in dark greenish - grey, green 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 Greenschist are blackboards, manufacture of tools, writing slates.