German: Kreide.
Clades:
Carbonates.
Chemical:
Region: Western Europe, France, Dover cliffs England.
Color: white, grey.
Use: for quicklime, bricks, builder's putty; for lowering acidity in agriculture; for writing on blackboard.
MineralogyChalk is a soft, friable, porous, sedimentary limestone, carbonate rock. It is a form of limestone composed of the mineral calcite.