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Opal is a hydrated amorphous form of silica ); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous ...

Andamooka Opal-Galaxy Opal-Opal (disambiguation)-Flame Queen Opal

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    Now available on iPhone and Mac. Better than screen time settings, Opal helps you focus on what matters so you can make the most out of every day.

    Explore how Opal unlocks planning & visualization for brand builders – and see why we're trusted by Target, Starbucks, GM & more!

    With an opal, clarity is its degree of transparency and freedom from inclusions. An opal's clarity can range all the way from completely transparent to opaque.

    For thousands of years, people have mined and treasured opals. These striking stones are the traditional October birthstone and have inspired a rich body of ...

    Opals are crispy, sweet, and naturally non-browning. Taste the difference and make a difference with Opal® organic apples.

    A type of Opal consisting of aggregated spheres of amorphous silica, with water filling the gaps in between. Precious Opal and Potch Opal consist of this kind ...

    Chert-Porcellanite-Sinter-Opaline-porcellanite

    Opal Auctions is the biggest online marketplace for buying loose Opals, rough Opals and Opal Jewelry. We have individual verified Opal stores with sellers ...

    Rough Opal-Opal Jewelry-Crystal Opal-Opal Doublet

    Better than screen time, Opal helps you focus so you can make the most out of every day. 4 hours. That's the average time you'll spend looking at your phone ...

    オパール

    オパール(opal)は、鉱物(酸化鉱物)の一種。潜晶質であるため、厳密には準鉱物であるが、国際鉱物学連合ではオパールを正式な鉱物としている。和名と中国語名は蛋白石(たんぱくせき)。 西洋語のオパールを指す語は、ギリシア語 opallios、または、そのラテン語化 opalus に…-Wikipedia