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- Opal - Wikipedia
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 the amorphous (chemical) physical structure, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals
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- Pictures of Opal - Black, Fire, Boulder, Blue and Pink
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
- 61 Authentic Spots To Find Opal in Nevada in 2025 - Rock Chasing
Explore where to mine for opal in Nevada and discover the state's hidden gemstones Learn the best spots for opal hunting
- 14 Different Types Of Opal And What They All Look Like
Opal is a fascinating mineral known for its unique play of colors and diversity There are many types of opal, each with distinct characteristics that make them special For example, boulder opal, hyalite, and fire opal are all unique forms of this mineral
- Opal Gemstone | Opal Stone – GIA
Opal is an October birthstone Grids of silica spheres 0 2 microns in size create red play-of-color flashes Opal contains up to 20% water trapped in its silica structure The novel “ Anne of Geierstein ” gave opal a reputation of being unlucky
- Opal | Properties, Types Uses | Britannica
Opal, silica mineral extensively used as a gemstone, a submicrocrystalline variety of cristobalite In ancient times opal was included among the noble gems and was ranked second only to emerald by the Romans
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