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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.
Sena Madureira | |
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Population | 40630 |
Sena Madureira (Portuguese pronunciation: [ˈsẽnɐ maduˈrejrɐ]) is a municipality located in the center of the Brazilian state of Acre. Its population is 46,511 and its area is 25,278 square kilometres (9,760 sq mi), making it the largest municipality in the state. It has a climate which combines temperatures of 78 °F (26 °C) with humidities in the upper 90s percent, all year round.
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