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Opal mineraloid, classified as silicate.
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Opal, the name comes from the Sanskrit word 'upala' which means gem or gemstone, or the Greek 'opalios' to see the color change. Opal is an amorphous mineral, devoid of a crystalline structure. Opal is a mineral whose play of colors called iridescence is a unique phenomenon and incomparable to anything else.
Opal was one of the first precious stones, highly valued already in ancient times. The ancient Greeks valued opals as well as diamonds, and the Romans made beautiful jewelry from them. The popularity of opals has been going on for centuries and continues to this day, enchanting with its charm. Opal is most often cabochon cut, faceted cut is rarely used.
It occurs as a gap filler in all types of rocks, but especially near geysers and hot springs. The water content has a great influence on the play of colors. The varieties of opal, depending on the color and admixtures, are divided into the following groups: noble, fiery and ordinary.
The color of opal is highly dependent on metal compounds and inclusions contained in it. The water content has a great influence on the play of colors, opal usually contains from about 3% to 14%, and rarely reaches 34%. There are also opals that are virtually free of water.
Precious Opal: White opal also known as milk opal. A stone with a white or other bright primary color and a play of colors. Black opal with a dark gray, dark blue, dark green or gray-black color. The highest-rated opals. Matrix opal, striped fusion to the bedrock or the growth of opal into it. Harlequin opal, transparent or translucent. It is one of the most wanted opals. Jelly opal, bluish gray with a weak play of colors. Crystal opal, slight red reflections on a colorless glassy background. Girasol opal, almost colorless, transparent with a bluish glow.
Fire Opal is a variety dominated by red and yellow, one of the most beautiful.
Common Opal is opaque, rarely translucent and has no play of colors: Opal Agate, agate with light and dark layers of opal. Wood opal, yellowish and brownish, opal as petrified wood. Honey opal, honey-yellow translucent opal. Glass opal, colorless opal with a strong shine as clear as water. Water opal, cloudy due to water loss. After absorbing water, it becomes translucent and opalescent again. Moss opal, milky with dark dendrites. Prase opal, apple green. Wax opal, yellow-brown with a waxy sheen.
Occurrences: Australia, Brazil, Ethiopia, Guatemala, Honduras, Mexico, South Africa, United States, Zimbabwe.
Opal in astrology: Western astrology links opal with the zodiac sign of: Libra, Pisces, and with the month of October. Chinese Astrology link it with the Year of Snake.
Data sheet
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