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Bookmark or Share- Opal | Properties, Types & Uses | BritannicaOpal, 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. In the Middle Ages it was supposed to be lucky, but in modern times it has been regarded.
- Opal - WikipediaOpal 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.
- Opal Gems: Value, Price, and Jewelry Information - IGSFor thousands of years, people have mined and treasured opals. These striking stones are the traditional October birthstone and have inspired a rich body of folklore. (So rich, in fact, opal gems have been considered both the luckiest and unluckiest stones you can wear).
- Opal Gemstone | Opal Stone – GIAOpal 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.
- 14 Different Types Of Opal And What They All Look LikeOpal 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.
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