Know all about Chalk and Troctolite properties here. All properties of rocks are important as they define the type of rock and its application. Chalk belongs to Sedimentary Rocks while Troctolite belongs to Igneous Rocks.Texture of Chalk is Clastic or Non-Clastic whereas that of Troctolite is Phaneritic. Chalk appears Soft and Troctolite appears Veined and Shiny. The luster of Chalk is dull while that of Troctolite is not available. Chalk is available in grey, white, yellow colors whereas Troctolite is available in dark grey to black 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 Troctolite are cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones.