Amethyst the amethyst is the appreciated rock more of the group of the quartz. Its crystals always grow on a base. When they have format of pyramids, the
color most intense predominates in the tips of crystals. Some varieties of amethyst exist, being able to present white bands of quarzo milky. The name, Amethyst, come of the Greek and probably it means not drunk or not drunkard still whom had, probably, to its history in mythology.
Alexandrita One of the místicas
rocks. It is an
emerald of day and one rubide night. To the light of the day it is green e, with artificial, red light. The more thick the rocks, greater the easiness of if seeing the color change. Its name, alexandrita, it must the Czar Alexander II. The stoned alexandrita greater weighs 66 ct and is in Whashington the
deposits of Alexandrita is located mainly in Sri Lanka and Zimbabue and Brazil, but the found ones old in the Urais Mounts do not possess a change of very expressiva color how much, in Russia. In 1987, a alexandrita was discovered in Brazil where the color change is impressive. The deposits of Alexandrita are located mainly in Sri Lanka and Zimbabue and Brazil, but the found ones old in the Urais Mounts do not possess a change of very expressiva color how much, in Russia. In 1987, a alexandrita was discovered in Brazil where the color change is impressive. Opal the opals are rocks known for its great variety of
colors in the same rock. Its game of colors varies angle according to where if it looks at. It has times behind, these colors were explained as being a refraction of the light on very fine blades Hoje we know that they are very small enclosed spheres of the cristobalita crystal in a silica mass. The name OPAL is of sânscrita origin upala that it wants to say precious rock. Opals of raised quality arrive to be more valuable that diamonds, being able to arrive U$ 20,000 for carat. Until the beginning of this century, the opals noblest came from the eastern extremity of Czechoslovakia. Soon later deposits had been found Australian, of good quality. Deposits in Brazil, Guatemala, Honduras, Japan and U.S.A. also exist. One gives credit that the opals delay 60 million years approximately to form themselves. Tourmaline No egg yolk possesss as much variety of colors as the tourmaline. The dutches had taken tourmalines á Europe in 1703. The name comes of the singalês, turamali. The tourmalines of one color are only very rare. In one exactly cristasl occurs, with frequency, distinct tonalities and also colors. The tourmaline deposits most important are in Sri Lanka, Republic of malgaxe, Brazil and Moçambique. Ruby the name ruby comes of the Latin Ruber that means red. As well as the
sapphire it is of the group of the Coríndons. It is the mineral hardest after the diamond. As well as emeralds, they possess many inclusions that are tests of its legitimacy. But 1% of the rubies are used for jewelry shop. The great rubies are rare and very valuable. The biggest worthy ruby of being lapidade had 400ct and was found in the Birmânia. The deposits of Ruby are located mainly in Sri Lanka, Birmânia, Thailand and Tanzânia Diamond the name diamond comes of the Greek and means inconquistável, indomável due its hardness. It has, in famous history, diamonds, mainly for its size or its color. In Brazil, the first diamonds had been found in 1725, in Diamantina-MG. During centuries XVIII and XIX, Brazil led the world-wide diamond production, surpassed later by Africa of South Only 20% of diamonds is used for jewelry shop, all the remaining portion is used to advantage in the industrial area. Currently, Africa of the South is the producing greater of diamonds of the world. They had been found, in this country, volcanic chimneys that the diamantífera first rock contains. Other places of the Land can also be found in many, as Brazil and Siberia. Emerald the emerald, as well as the beryl and the water-navy, is of the group of the beryl and is the rock noblest of it. Seunome provém of the Greek smaragdos, but the origin probably is of the old Hindu and means rock green. The qualities most precious of emerald are only transparent. Generally this rock appears with inclusions and these are not considered defects since that they are not important. These inclusions, many times, are test of that the rock is authentic. The emerald deposits most important are in Colombia. The best one of them was explored by incas and later abandoning. In séc XVII this deposit will be redescoberta and possesss emeralds of very fine quality. Deposits in Brazil and the Zimbabue also exist. Sapphire the name Sapphire, comes of the Greek and means blue. Old, the name sapphire was used to assign to all the blue rocks. The sapphire belongs to the same group of the ruby, the group of coríndon. The sapphires possess diverse colors, since the blue one, turn yellow, roséa, orange therefore the only color of the family of coríndons that it is not sapphire is the red, that is the ruby. In 1966, the biggest covered with star sapphire was found astérica, a crystal of 63.000 carats = 12,6kg.
More summaries about the precious rocks