Know all about Chalk and Rapakivi Granite properties here. All properties of rocks are important as they define the type of rock and its application. Chalk belongs to Sedimentary Rocks while Rapakivi Granite belongs to Igneous Rocks.Texture of Chalk is Clastic or Non-Clastic whereas that of Rapakivi Granite is Granular, Phaneritic. Chalk appears Soft and Rapakivi Granite appears Veined or Pebbled. The luster of Chalk is dull while that of Rapakivi Granite is dull to grainy with sporadic parts pearly and vitreous. Chalk is available in grey, white, yellow colors whereas Rapakivi Granite is available in black, grey, orange, pink, 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 Rapakivi Granite are cemetery markers, commemorative tablets, creating artwork, curling, laboratory bench tops, tombstones.