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Calcite: calcite forms and is stable at the Earth's surface. Some calcite is formed from precipitation, but much of the calcite in sedimentary rocks is formed by biological activity. Many marine organisms secrete skeletal material (shells) of calcite.In addition to these three most abundant minerals, some sedimentary rocks also contain the iron oxides hematite and limonite, and small amounts of feldspars and micas.any marine organisms secrete skeletal material (shells) of calcite. In addition to these three most abundant minerals, some sedimentary rocks also contain the iron oxides hematite and limonite, and small amounts of feldspars and micas.
coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals coral reefs are built by colonies of tiny animals found in marine waters that contain few nutrients most coral reefs are built from stony corals which in turn consist of polyps that cluster in groupsthe polyps belong to a group of animals known as cnidaria which also includes sea anemones and jellyfishoral reefs are built by colonies of tiny animals found in marine waters that contain few nutrients most coral reefs are built from stony corals which in turn consist of polyps that cluster in groups the polyps belong to a group of animals known as cnidaria which also includes sea anemones and jellyfish