Know all about Chalk and Scoria properties here. All properties of rocks are important as they define the type of rock and its application. Chalk belongs to Sedimentary Rocks while Scoria belongs to Igneous Rocks.Texture of Chalk is Clastic or Non-Clastic whereas that of Scoria is Vesicular. Chalk appears Soft and Scoria appears Glassy and Vesicular. The luster of Chalk is dull while that of Scoria is subvitreous to dull. Chalk is available in grey, white, yellow colors whereas Scoria is available in black, brown, dark grey to black, red 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 Scoria are as a traction material on snow-covered roads, creating artwork, high-temperature insulation, in gas barbecue grills.