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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.
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Kansas ( (listen)) is a U.S. state in the Midwestern United States. Its capital is Topeka and its largest city is Wichita. Kansas is bordered by Nebraska to the north; Missouri to the east; Oklahoma to the south; and Colorado to the west. Kansas is named after the Kansas River, which in turn was named after the Kansa Native Americans who lived along its banks. The tribe's name (natively kką:ze) is often said to mean "people of the (south) wind" although this was probably not the term's original meaning. For thousands of years, what is now Kansas was home to numerous and diverse Native American tribes. Tribes in the eastern part of the state generally lived in villages along the river valleys. Tribes in the western part of the state were semi-nomadic and hunted large herds of bison.
Kansas was first settled by Americans in 1827 with the establishment of Fort Leavenworth. The pace of settlement accelerated in the 1850s, in the midst of political wars over the slavery debate. When it was officially opened to settlement by the U.
Aberdeen ( (listen); Scots: Aiberdeen [ˌeːbərˈdin] (listen); Scottish Gaelic: Obar Dheathain...
Nuremberg ( NEWR-əm-burg; German: Nürnberg [ˈnʏʁnbɛʁk] (listen); in the local East Franconian...
Chemnitz (German: [ˈkɛmnɪts] (listen), from 1953 to 1990: Karl-Marx-Stadt, pronounced...