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[citation needed] Open oysters should be tapped on the shell; a live oyster will close up and is safe to eat. [citation needed] Oysters which are open and unresponsive are dead and must be discarded. Some dead oysters, or oyster shells which are full of sand, may be closed. These make a distinctive noise when tapped, and are known as "clackers".
Marine biogenic calcification is the production of calcium carbonate by organisms in the global ocean.. Marine biogenic calcification is the biologically mediated process by which marine organisms produce and deposit calcium carbonate minerals to form skeletal structures or hard tissues.
The shell of an oyster; A product made from the shell of the oyster, such as calcium supplements for humans or laying hens; Oystershell scale, a type of insect; Oystershell NV, a technology company in over-the-counter medicinal products
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The shell can be rounded or elongated and is white to purplish black and may be striped with yellow or brown. Unlike most bivalves, the Olympia oyster's shell lacks the periostracum, which is the outermost coating of shell that prevents erosion of the underlying shell. The color of the oyster's flesh is white to a light olive green.
It is usually made from calcium-high materials; the calcium helps the bird in egg shell production. Soluble grit can be made from limestone or coarsely ground or broken seashells, like oyster or mussel shells; this kind of grit is also called shell grit. [1] Other uses for shell grit include protecting plants from slugs or snails [2] and for ...