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  Eggshells, snail shells and most seashells are predominantly calcium carbonate and can be used as industrial sources of that chemical. Oyster shells have enjoyed recent recognition as a source of dietary calcium, but are also a practical industrial source. Dark green vegetables such as broccoli and kale contain dietarily significant amounts of calcium carbonate, however, they are not practical as an industrial source either as a building material or limestone aggregatefor road building or as an ingredient of cement or as the starting material for the preparation of builder's lime by burning in a kiln. However, because of weathering mainly caused by acid rain, calcium carbonate (in limestone form) is no longer used for building purposes on its own, but only as a raw/primary substance for building materials A seashell is usually the exoskeleton of an invertebrate (an animal without a backbone), and is typically composed of calcium carbonate or chitin. Most shells that are found on beaches are the shells of marine mollusks, partly because these shells are usually made of calcium carbonate, and endure better than shells made of chitin driftwood, and messages in bottles. Items such as lumber, plastics, and all manner of things that have been lost or discarded by seagoing vessels will be collected by some beachcombers, as long as the items are either decorative or useful in some way to the collector. (However, this usually does not include the great bulk of marine debris, most of which is neither useful nor decorative.)rtificial "sea" glass to actually be genuine sea glass, but rather simply tumbled glass, where pieces of modern-day glass are tossed into a rock tumbler or dipped in acid to produce the desired finish. Artificially-produced, the glass is much less expensive and is used for making jewelry, but is often passed off as real placing a piece of sea glass in a loosely defined era. Along with knowledge of historical trading partners that visited the search locations, production sources can be deduced, but a single feature is not a reliable indicator of origin. Many similar features over a broad sample narrow the choices. Particular substances became associated with certain color, and shapes of bottles