Opal on bedrock

Opal on bedrock

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Opal on bedrock. Opal is a form of hydrous silicon oxide (silica, SiO2). After it has been cut and polished, it has a distinctive blue irridescent sheen. Opal never occurs in a crystalline form, but occurs as veins, globules and crusts. The specimen shown here is 65mm across.

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Keywords: abstract, bed rock, bedrock, blue, chemical, chemistry, earth science, gem, gemstone, geology, host-rock, hydrous silicon oxide, iridescent, mineral, mineralogy, opal, ore, precious stone, rock, si02, silica, turquoise

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