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.
Bloodstone, also known as heliotrope, is a green gemstone dotted with bright red spots of iron oxide. Pearl. Pearls are products of bivalve mollusks (mainly oysters and mussels). They are built up of nacre, which is mainly calcium carbonate in the form of aragonite crystals.podumene is a relatively new mineral to science, with gem varieties discovered only in the last 120 years. Spodumene occurs in white, gray, pink, lilac and green. Fluorite. Fluorite is a mineral with a veritable plethora of brilliant colors that include purple, blue, green, yellow, colorless, brown, pink and orange.