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A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as fossil conulariids. Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) in minute crystalline form, which has deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes, known as baroque pearls, can occur. The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, pearl has become a metaphor for something rare, fine, admirable and valuable.
The most valuable pearls occur spontaneously in the wild, but are extremely rare. These wild pearls are referred to as natural pearls. Cultured or farmed pearls from pearl oysters and freshwater mussels make up the majority of those currently sold.
Mostaganem | |
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Population | 145696 |
Mostaganem (Berber languages: Mustɣanem; Arabic: مستغانم) is a port city in and capital of Mostaganem province, in the northwest of Algeria. The city, founded in the 11th century lies on the Gulf of Arzew, Mediterranean Sea and is 72 km ENE of Oran. It has 245,330 inhabitants as of the 2014 census.The city was founded in the 11th century as Murustage but has origins going back to Punic and Roman times.
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