Opal surface, SEM

Opal surface, SEM

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This image is part of the feature Nature's Trick Of The Light

Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Opal. Coloured scanning electron micrograph (SEM) of the fractured surface of an opal, a type of precious stone. Opal is a form of hydrated, amorphous silica (SiO2). The glittering iridescent colours of an opal are due to water molecules trapped in the silica structure.

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Keywords: chemical, chemistry, coloured, compound, cut, fracture, fractured, gem, gemstone, geological, geology, hydrated, images, iridescent, magnified image, microscopic photos, mineral, opal, precious, scanning electron micrograph, sem, silica, stone, subjects, surface

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