Oyster shell with pearl

Numéro d’image : 11631603
Oyster shell with pearl
Oyster shell with pearl. Pearls are accretions of nacre (calcium carbonate) secreted by certain oysters and mussels. The presence of a foreign body (such as a parasite or a grain of sand) within the shell triggers the secretion of nacre by the mollusc's mantle. Thin layers are deposited on the irritant particle and,over several years,a pearl is formed. Although commercially valuable pearls are obtained from freshwater mussels and oysters,precious pearls can come from ocean oysters. Cultured pearls are cultivated by inserting fragments of clam shell into the shells of farmed mussels and oysters
Licence : Droits gérés
Crédit: Science Photo Library / Natural History Museum, London
Taille de l’image : 4254 px × 4109 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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