name of the stone opal comes from the Latin word "opalus", as well as the Sanskrit "upala", which means "precious stone".Physical parameters presented mineral silica hydrogel.It follows that the stone is amorphous silica, which contains up to 10% water.Opals were called "Treskunov."This is due to the fact that some species may absorb some of the liquid, and drying time - lose its effect cracking.
Painting natural opals is quite varied, it has shades of all colors.Varieties include more than 100 mineral species.This is due to inclusions of manganese, iron, nickel and other elements.
Some opals, depending on the color, have their own names.Consider the most famous among them.
very precious opals are among the precious black opals.This gem is exquisitely beautiful.This set of on a contrasting dark background of shimmering colors can be totally different.Mineral able iridescent.Also, the black opal can have a combination of shades.Among these are blue with red, blue, purple, blue and green, and other combinations.
cost gemstone depends on the amount absorbed the colors, the uniform distribution of color and contrast on the completeness of the background.With the increase of these factors increases the value mineral.Thus, the black opal (photo), weighing 2 grams - 10 carat and include five basic colors, will have a price of around $ 20,000.This assessment is essentially subjective and depends on the beauty of jewelry and opinions of the buyer or seller.
Black Opal is found on almost every continent.Australian deposits include more than 95% of the total production of the mineral on the planet.Mining of opal with a predominance of black color mainly occurs in the state of South Wales.This type is the most rare, as is only about 5% of the total mined in Australia, gemstones of this kind.In addition, the extraction of precious minerals firmly engaged in Guatemala, Peru, the Czech Republic, Brazil, United States (Nevada), Mexico.
Medieval Medicine claims that the mineral has a number of medicinal properties: it helps in heart disease, irritation, fear, calms the nerves, safeguard against violent passions, helps regain luster eyes and visual acuity.Black Opal Litoterapists believe one of the most effective tools to help get out of depression.It is believed that it cures insomnia and nightmares.It is said that everyday scrutinizing a few minutes helps to reduce eye pressure, thereby improving vision.
Mineral quite supportive of Pisces and Scorpio and can provide some ability to anticipate danger.
Argued that black opal increases cravings for perverse pleasure in people with a weak character.The white stone, on the contrary, strengthens the spirit, creating around human peace and harmony.
