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