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No Reserve Opal Online Auctions 25 x 22 x 18mm 55 carats Auction #535097 Opal Auctions

Super Colour Contra Luz Natural Ethiopian Welo Rough Opal " is this a natural light? 68mm - Mineral! RARE Fossil Wood PRECIOUS OPAL Crystal

Rare Fossil Wood Precious Opal Crystal - Virgin Valley, Nevada in Collectibles, Rocks, Fossils & Minerals, Crystals & Mineral Specimens

Geyser opal

Geyser Opal from Spencer Idaho U.A Spenser Opal was deposited in volcanic rocks app 4 million years ago by geysers.The primary formation of the Spencer opal mines is a rhyolite and obsidian flow.