Know all about Chalk and Gneiss properties here. All properties of rocks are important as they define the type of rock and its application. Chalk belongs to Sedimentary Rocks while Gneiss belongs to Metamorphic Rocks.Texture of Chalk is Clastic or Non-Clastic whereas that of Gneiss is Banded, Foliated, Platy. Chalk appears Soft and Gneiss appears Foliated. The luster of Chalk and Gneiss is dull. Chalk is available in grey, white, yellow colors whereas Gneiss is available in black, brown, pink, red, white 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 Gneiss are cemetery markers, jewelry, tombstones, used in aquariums.