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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.
Leeuwarden | |
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Leeuwarden (US: , Dutch: [ˈleːʋɑrdə(n)] (listen); West Frisian: Ljouwert [ˈljɔːʋ(ə)t]/[ˈʎɔːw(ə)t] (listen); Town Frisian: Liwwadden; Leeuwarder dialect: Leewarden) is a city and municipality in Friesland in the Netherlands. It is the provincial capital and seat of the States of Friesland. The municipality has a population of 122,293.
The region has been continuously inhabited since the 10th century. It came to be known as Leeuwarden in the early 9th century AD and was granted city privileges in 1435. It is the main economic hub of Friesland, situated in a green and water-rich environment. Leeuwarden is a former royal residence and has a historic city center, many historically relevant buildings, and a large shopping center with squares and restaurants.
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