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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 ...

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

Bright flashes of color skip across this stone's surface. ... Opal forms as irregular nodules or seams in volcanic or sedimentary rocks. ... Play-of-color results ...

Buyer's Guide-Opal Description-Opal Quality Factors-Opal History and Lore

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

    Black Opal-Rough Opal-Boulder Opal-Ethiopian Opal

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    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 ...

    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 ...

    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.

    Shop our stunning collection of Black Opal from Australia's Lighting Ridge online today. Fast worldwide shipping & a 30 day return policy.

    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