Pompon agate

Pompon agate

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Credit: NATURAL HISTORY MUSEUM, LONDON/SCIENCE PHOTO LIBRARY

Caption: Pompon, or thunder egg, agate. Agate is an aggregate of different forms of silica (SiO2) that have formed concentric bands within a geode. A geode forms when the silica precipitates from liquid onto the inside surface of an empty pocket in a host rock.

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Keywords: agate, amorphous, black background, chalcedony, cross section, cross-section, cut, earth science, geode, geological, geology, mineral, mineralogy, pattern, patterned, patterns, polished, pompon agate, section, sectioned, silica, silicon dioxide, slice, specimen, stone, surface, thunder egg agate

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