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Opal - Wikipedia Opal is a hydrated amorphous form of silica (SiO 2 ·nH 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%
Pictures of Opal - Black, Fire, Boulder, Blue and Pink Photos of opal from around the world Guidance for people who want to buy opal, see different types of opal, understand their names, learn about synthetics and imitations
Opal Stone: Meanings, Properties and Uses - The Complete Guide Opals are separated into two groups, common Opal (also known as potch) and precious Opal (also known as noble Opal) Opal can be found all over the world from Cornwall to Canada, Australia to Siberia, Ethiopia, Madagascar, and many other locations
Opal Gemstone | Opal Stone - GIA 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
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
Opal : Properties, Formation, Uses and Deposits » Geology Science 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 Gemstone: History, Properties, Types, and Care Explore the enchanting world of opal, a gemstone known for its mesmerizing play-of-color and unique beauty Learn about its formation, properties, famous finds, types of opal, and how to care for this delicate gem in our comprehensive guide
Opal Information - More to it than a dazzling play of colors - GemSelect Opals flash the colors of a rainbow as you turn or move the gemstone in a phenomenon known as play-of-color These precious stones are often up to 20% water and made up of tiny spheres of silica and oxygen formed in cracks in rocks or layers of clay or even inside fossils