Extraction of limestone and clay at Suez Cement Company
Limestone is a common type of carbonate sedimentary rock. It is composed
mostly of the minerals calcite and aragonite, which are different crystal forms
of calcium carbonate (CaCO3).
Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological
processes, though biological processes have likely been more important for the
last 540 million years.