Iron oxide precipitation in agate

Iron oxide precipitation in agate

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Iron oxide precipitation in agate. The agate forms in layers by the deposition of silica inside a host rock. Impurities in the silica precipitate out, creating the colours and patterns seen here. This relatively common type of pattern, appearing like mountain peaks, is known as a landscape agate.

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Keywords: agate, chalcedony, close-up, colour, colourful, colours, crystal, crystalline, crystals, cut, deposit, deposits, detail, earth science, geological, geology, impurities, impurity, iron oxide, landscape agate, layer, layers, metal, mineral, mineralogy, minerals, polished, precipitated, precipitation, quartz, rock, rocks, section, sectioned, silica

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