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Pearl | |
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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.
Piura | |
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Population | 60352 |
Piura (Quechua: Piwra) is city in northwestern Peru located in the Sechura Desert on the Piura River. It is the capital of the Piura Region and the Piura Province. Its population was 484,475 as of 2017.
It was here that Spanish Conqueror Francisco Pizarro founded the third Spanish city in South America and first in Peru, San Miguel de Piura, in July 1532.