Cross-section of tubular agate

Cross-section of tubular agate

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Cross-section of tubular agate, close-up. Agate is an aggregate of different forms of silica (SiO2) within a geode. A geode forms when the silica precipitates from liquid onto the inside surface of an empty pocket in a host rock. Thiscross-section shows tubules, thought to be the inlets of infiltration by which the mineral-laden aqueous solution permeated. Actual height: 26 centimetres.

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Keywords: agate, aqueous, channel, channels, close-up, cross section, cross-section, cryptocrystalline, cut, detail, earth science, gem, gemstone, geode, geological, geology, infiltration, inlet, inlets, microcrystal, microcrystals, mineral, mineralogy, pattern, patterned, patterns, permeation, polished, red, route, section, sectioned, silica, siliceous, silicon dioxide, slice, solution, stone, surface, tube, tubes, tubular, tubule, tubules

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