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Opal - Wikipedia For use in jewellery, most opal is cut and polished to form a cabochon, a convex shape that maximises the viewing angles through which an opal's play of colour can be observed "Natural" opal refers to polished stones consisting wholly of precious opal
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 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
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
What Is Opal: Everything You Need to Know - Nobbier What Is Opal? Opal is a hydrated amorphous form of silica (SiO₂·nH₂O) containing between 3-21% water within its mineral structure Unlike crystalline gemstones that have orderly, repeating atomic structures, opals form from silica-rich solutions that flow into cracks and cavities in rock