Uncommon big Inexperienced-Blue Opal Discovered In Nevada

Picture credit score: Chip Clark

The Roebling Opal is a unprecedented 2,585-carat piece of opal tough and can also be the most important unpolished black Opal.

It got here out of the tunneled portion of the Rainbow Ridge Mine in 1917 from Virgin Valley, Nevada. The opal was deposited from silica-wealthy water in voids that remained after buried tree limbs had rotted away, in some instances leading to opal casts of the unique tree elements.

Though extraordinarily lovely, opal from this locality just isn’t generally utilized in jewellery as a result of it tends to craize, or crack. Opals with a vivid play-of-colour and a black or different darkish physique shade are referred to as black opals. The Roebling Opal is a black opal with flashes of blue and inexperienced play-of-shade.

The Roebling Opal was donated by John A. Roebling in 1926 and now rests with the Smithsonian Nationwide Museum of Pure Historical past.

Picture credit score: Chip Clark
Picture credit score: Chip Clark

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