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Most calcium carbonate deposits are made up of the skeletal remains of marine plants and animals that have fallen to sediment on the bottom of shallow seas after their death. If the conditions are right, these sediments can build up over geological time to form extremely thick layers.
Calcium 42 Carbonate (Calcium-42) is a stable (non-radioactive) isotope of Calcium. It is both naturally occurring and produced by fission. Calcium 42 Carbonate is one of over 250 stable isotopes produced by American Elements for biological and biomedical labeling, as target materials and other applications. Calcium Carbonate is also available in ultra high purity and as nanoparticles.