Limestone types may be formed either inorganically or biochemically and include coral reefs, chalks, coquina and oolitic limestone. Limestone is composed of calcite and makes up approximately 10 percent of all sedimentary rocks.Know More
Limestone is found in many parts of the world, both on land and in water, including Central America and England. Numerous conditions exist to produce many types of limestone. The skeletons of invertebrate animals make up limestone originating from coral reefs. Algae that live within the reefs secrete calcium carbonate to seal the structures of the organisms together, helping to form the hardened structures.
Chalk is an example of a biochemically produced limestone. It is produced from the skeletal parts of marine organisms. Poorly cemented shells and shell fragments produce the limestone that is known as coquina.
Caves contain inorganic limestone sources known as stalactites and stalagmites. Calcium carbonate, that is dissolved in water, forms limestone that is often referred to as dripstone. Oolitic limestone is another type of limestone that is inorganic. It is formed from spherical grains called ooids. Small particles that are suspended on shallow marine waters are where these grains form. Calcium carbonate is present in the water and forms in layers, contributing to the limestone formations.Learn more about Geology
When grouped by shape or lattice, the seven types of crystals are cubic or isometric, orthorhombic, tetragonal, hexagonal, trigonal, triclinic and monoclinic. Crystals are also grouped by their chemical and physical properties.Full Answer >
There are three types of rock on the Earth's surface: metamorphic, sedimentary and igneous. Metamorphic rocks are rocks that have changed from one form to the other. Sedimentary rocks are formed from compressed layers of organic and inorganic matter, while igneous rocks are formed from cooled and hardened magma.Full Answer >
Limestone comes from either the accumulation of organic debris of shells, fecal matter, algae and corals or from dissolved calcium carbonate depositing on the seafloor. It is primarily made of calcium carbonate in the form of the mineral, calcite. Limestone generally forms in clear, warm, shallow marine environments.Full Answer >
Limestone can be formed as a result of evaporation, as is the case for stalactites and stalagmites in caves, or through the accumulation of calcium carbonate in marine environments. Limestone is either a biological or a chemical sedimentary rock, depending on its method of formation.Full Answer >