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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
蛋白石 | 蛋白石 - GIA The Challenges of Cutting a Large Gem Opal Rough Theodore Grussing , 八月 3, 2016 阅读详细内容(英语) 璀璨内陆:探秘澳大利亚的蛋白石矿场 Tao Hsu, Andrew Lucas, and Vincent Pardieu , 二月 1, 2016 阅读详细内容(英语) 产自埃塞俄比亚的黑蛋白石新矿床
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 - The #1 Screen Time App Real Focus in Real-Time Measure and improve your focus day by day, on iPhone, iPad and macOS
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 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
Googles vibe-coding tool Opal comes to Gemini | TechCrunch The company on Wednesday said it is integrating the tool, which lets you build AI-powered mini apps, inside the Gemini web app, allowing users to create their own custom apps