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 structure, it is classified as a mineraloid, unlike crystalline forms of …
Opal Stone: Meanings, Properties and Uses - The Complete Guide
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.
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.
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
Nov 11, 2024 · 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.
14 Different Types Of Opal And What They All Look Like - Rock …
Jan 3, 2024 · 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 Gems: Value, Price, and Jewelry Information - IGS
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.
Opal : Properties, Formation, Uses and Deposits » Geology Science
Jul 1, 2024 · Opals are a unique and mesmerizing gemstone known for their distinctive play of color, making them one of the most sought-after and mysterious gemstones in the world. In this introduction, we will provide a definition and a brief overview of opals.
Opal Description - GIA
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.
Opal Healing Properties, Meanings, and Uses - Crystal Vaults
Opal is most known for its ability to bring one’s traits and characteristics to the surface for examination and transformation. Just as Opal absorbs and reflects light, it picks up thoughts and feelings, desires and buried emotions, amplifying them and returning them to the source.