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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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Breckland in Norfolk and Suffolk is a 39,433 hectare Special Protection Area (SPA) under the European Union Directive on the Conservation of Wild Birds. The SPA partly overlaps the 7,544 hectare Breckland Special Area of Conservation. As a landscape region it is an unusual natural habitat of England. It comprises the gorse-covered sandy heath that lies mostly in the south of the county of Norfolk but also in the north of Suffolk. An area of considerable interest for its unusual flora and fauna, it lies to the east of another unusual habitat, the Fens, and to the south west of the Broads. The typical tree of this area is the Scots pine. Breckland is one of the driest areas in England.
The area of Breckland has been substantially reduced in the twentieth century by the impact of modern farming and the creation in 1914 of Thetford Forest. However substantial areas have been preserved, not least by the presence of the British Army on the Stanford Battle Area.
During the Prehistoric period Breckland was mined for flint, evidence for which can be found at Grimes Graves just outside Thetford in Norfolk. The word 'Breck' is medieval and was defined as being an area of heathland broken up for cultivation before being allowed to retreat back into wilderness.
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