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.
Limestone, sedimentary rock composed mainly of calcium carbonate, usually in the form of calcite or aragonite. It may contain considerable amounts of magnesium carbonate (dolomite) as well; minor constituents also commonly present include clay, iron carbonate, feldspar, pyrite, and quartz.
Limestone is one of the most abundant and widely used sedimentary rocks on Earth. Formed primarily from the skeletal fragments of marine organisms such as corals and mollusks, this rock tells the story of ancient oceans and the dynamic processes that shape our planet’s surface.
Most limestones form in calm, clear, warm, shallow marine waters. That type of environment is where organisms capable of forming calcium carbonate shells and skeletons can thrive and easily extract the needed ingredients from ocean water.
Learn about limestone – its calcite or aragonite composition, fossil-rich varieties, formation in marine environments, and industrial uses.
Explore the properties, formation, and diverse uses of limestone, a sedimentary rock critical to construction, agriculture, and sculpture. Learn about its types, famous landmarks, and how to care for limestone in this comprehensive guide.
It is a basic building block of the construction industry (dimension stone) and a chief material from which aggregate, cement, lime and building stone are made. 71% of all crushed stone produced in the U.S. is either limestone or dolomite.
Limestone is one of the most widespread rocks on Earth, known for its diverse uses in various industries and natural landscapes. This sedimentary rock was formed over millions of years by the accumulation and compression of marine organisms, especially shells and coral remains.