Know all about Variolite and Chalk properties here. All properties of rocks are important as they define the type of rock and its application. Variolite belongs to Igneous Rocks while Chalk belongs to Sedimentary Rocks.Texture of Variolite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Chalk is Clastic or Non-Clastic. Variolite appears Dull and Soft and Chalk appears Soft. The luster of Variolite is not available while that of Chalk is dull. Variolite is available in black, brown, light to dark grey colors whereas Chalk is available in grey, white, yellow colors. The commercial uses of Variolite are cemetery markers, creating artwork and that 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.