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Opal is a hydrated amorphous form of silica (SiO 2 ·nH 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals.
Opal is the product of seasonal rains that drenched dry ground in regions such as Australia’s semi-desert “Outback.” It is known for its unique display of flashing rainbow colors.
What Is Opal? Opal is one of the world's most popular gemstones and the birthstone for the month of October. A nice precious opal can flash every color of the spectrum with an intensity and quality of color that surpasses the fire of diamond. The best opals command prices per carat that rival expensive diamonds, rubies, sapphires, and emeralds.
Apr 11, 2019 · Opal is a mineraloid or crystalline form of silica. It is colorless when pure. The Precious forms of Opal occur in a wide variety of colors, including white, yellow, red, orange, green, black, and blue. Raw stones have a waxy, dull luster that polishes to a vibrant shine.
Aug 11, 2021 · Opal gemstones are hydrated silica crystals that form over millions of years. Learn about opal details, including stone meanings and symbolism, history, pricing, and value.
Opal gems are so unique you’ll need a special vocabulary to describe them. Learn all about the many opal varieties and how to evaluate them.
Sep 26, 2021 · Opals are a prime target for collectors. Contained within their crystals are worlds of fire, colored patterns, and wonder. Even common opal, with its light, milky colors is an awesome mineral. For collectors, the problem is where to begin. Let’s get into it.
OPAL – Glasses creator and manufacturer. Created in 1995 by François Fort, the Lyon-based company OPAL is now the European leader in frames for children and adolescents as well as the French leader in the second pair offered by opticians.
OPAL – créateur et distributeur de lunettes. Créée en 1995 par François Fort, la société lyonnaise OPAL est aujourd’hui leader européen de la monture pour enfant et adolescent, mais également leader français de la deuxième paire offerte par les opticiens.
Opal is known for its unique display of flashing rainbow colors called play-of-color. There are two broad classes of opal: precious and common. Precious opal displays play-of-color, common opal does not.
