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.
Ammolite belongs to a small group of organic gemstones, which also includes amber, coral, jet and pearl. Ammolite is composed of the fossilized shell remains of ammonites (primarily aragonite), which is the same mineral that makes up nacreous pearls.mmolite is extremely difficult to imitate; there are very few gemstones that bear a similar resemblance, including labradorite, spectrolite and precious opal. Though ammolite is rarer than opal, black opal is more valuable, so ammolite is sometimes used to imitate black opal.