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Opal - Wikipedia The internal structure of precious opal causes it to diffract light, resulting in play-of-color Depending on the conditions in which it formed, opal may be transparent, translucent, or opaque, and the background color may be white, black, or nearly any color of the visual spectrum
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 | 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 Description - GIA Opal is the product of seasonal rains that drenched dry ground in regions such as Australia’s semi-desert “outback ” The showers soaked deep into ancient underground rock, carrying dissolved silica (a compound of silicon and oxygen) downward
Opal Gemstone Information: Varieties, Colors, Care, and More Explore comprehensive opal gemstone information covering varieties like black, fire, and boulder opals, their colors and patterns, historical significance, care tips, and symbolic meanings for enthusiasts and buyers
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 - New World Encyclopedia Peruvian opal (also called blue opal) is a semi-opaque to opaque, blue-green stone found in Peru It is often cut to include the matrix in the more opaque stones