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Main opal producing countries. Opal is a hydrated amorphous form of silica (SiO 2 · n H 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.
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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. Gem Encyclopedia
Jan 3, 2024 · Learn about 14 different types of opal, from white to boulder, and how they form, look, and where they are found. Discover the unique features and colors of each opal, such as play-of-color, ironstone, and UV glow.
Learn about opal, a popular and colorful gemstone with a unique play-of-color phenomenon. See pictures of different types of opal, such as precious, fire, boulder, black, and common opal, and find out where they are mined.
Learn about opal's unique properties, value, price, and care. Find out the difference between precious and common opal, the types of opalized fossils, and the history of opal jewelry.
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.
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