Know all about Tachylite and Chalk properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite belongs to Igneous Rocks while Chalk belongs to Sedimentary Rocks.Texture of Tachylite is Vitreous whereas that of Chalk is Clastic or Non-Clastic. Tachylite appears Glassy and Chalk appears Soft. The luster of Tachylite is resinous while that of Chalk is dull. Tachylite is available in black, dark brown colors whereas Chalk is available in grey, white, yellow colors. The commercial uses of Tachylite 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.