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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.
Pasadena | |
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Population | 137122 |
Pasadena () is a city in Los Angeles County, California, United States, 11 miles (18 km) northeast of Downtown Los Angeles. It is the most populous city and the primary cultural center of the San Gabriel Valley. With its substantial downtown area, observers consider it as either a suburb of nearby Los Angeles, or as a significant urban center in its own right.Its population was 137,122 at the 2010 census and an estimated 141,029 in 2019, making it the 41st largest city in California and the ninth-largest city in Los Angeles County. Pasadena was incorporated on June 19, 1886, becoming one of the first cities to be incorporated in what is now Los Angeles County, following the city of Los Angeles (April 4, 1850).
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