Lysite agate

Lysite agate

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Credit: NATURAL HISTORY MUSEUM, LONDON/SCIENCE PHOTO LIBRARY

Caption: Lysite 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. The outer layers are variegated forms of chalcedony (amorphous or non-crystalline silica), with the layers becoming more crystalline towards the centre. Lysite agate is a continental sedimentary agate that derives its name from the village of Lysite, Wyoming, USA.

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Keywords: agate, american, amorphous, bands, black background, chalcedony, cross section, cross-section, cut, earth science, geode, geological, geology, lysite agate, mineral, mineralogy, pattern, patterned, patterns, polished, rings, section, sectioned, silica, silicon dioxide, slice, specimen, stone, surface, variegated, wyoming

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