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Bookmark or Share- Opal Stone: Meanings, Properties and Uses - The Complete GuideOpal 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.
- 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 the amorphous (chemical)physical structure, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals.
- 14 Different Types Of Opal And What They All Look Like - Rock ChasingOpal 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 | 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.
- Opal Gemstone | Opal Stone - GIAOpal 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.
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