Opal in its host rock

Opal in its host rock

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Caption: Opal in its host rock. Opal is a form of hydrous silicon oxide deposited from silica-bearing waters in voids and fissures of certain rock formations. Water molecules trapped in the silica account for the milky luster and brilliant pastel colours that make opal such a desirable precious stone. Specimen measures 250mm across, and was found in Opal Butte, Oregon, USA.

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Keywords: amercia, black background, earth science, gem, gemstone, geological, geology, host rock, hydrous silicon oxide, iridescent, mineral, mineralogy, natural, north america, opal, opal butte, oregon, polished, raw, rock, silica, specimen, specimens, still life, still-life, stone, us, usa

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