The Capital of China is, by far, the 3rd most populated city in the world. Having population of 21.5 million (21,516,000), with a population density of 1,300/km2, it is countryâs center for education, culture and politics. Talking about politics, this city is the hub of politics in the country for, as long as, eight centuries.
A pearl is an organic mineral mixture formed with the soft living tissue of a shelled mollusk.Chemically pearls are made of calcium carbonate, either the mineral aragonite or a mixture of aragonite and calcite, sometimes also with minor vaterite.Pearls are used as gemstones, but are not regarded as true minerals due to their organic origin. pearl is an organic mineral mixture formed with the soft living tissue of a shelled mollusk.
Pearl is an English vocabulary word for a small lustrous gemstone known as the pearl. In its natural state, a pearl is really an accident of nature. It is shaped by a mollusk (such as an oyster) through the secretion of calcium carbonate which forms around some irritant that gains access inside its shell (such as a parasite or grain of sand). The mollusk produces a pearl as a way of protecting itself from the foreign substance.