Know all about Chalk and Coquina properties here. All properties of rocks are important as they define the type of rock and its application. Chalk and Coquina belong to Sedimentary Rocks.Texture of Chalk is Clastic or Non-Clastic whereas that of Coquina is Clastic. Chalk appears Soft and Coquina appears Layered, Banded, Veined and Shiny. The luster of Chalk is dull while that of Coquina is dull to vitreous to submetallic. Chalk is available in grey, white, yellow colors whereas Coquina is available in beige, buff, orange colors. The commercial uses of Chalk and Coquina 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.