Geode in thin section

Geode in thin section

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Geode in thin section, close-up, viewed in transmitted polarised light. A geode forms when silica (SiO2) 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. Here, a core of quartz (the crystalline form of silica) can be seen. The banded arrangement of crystals are a result of changes in pressure, temperature, and mineral content occurring during the formation process. Magnification: x3.8 when printed 10 centimetres wide.

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Keywords: amorphous, bands, chalcedony, close-up, concentric, cross section, cross-section, cryptocrystalline, crystal, crystalline, crystals, cut, detail, earth science, gem, gemstone, geode, geological, geology, graded, light, macrocrystal, macrocrystals, microcrystal, microcrystals, mineral, mineralogy, pattern, patterned, patterns, polarised, polarised light, polarized, polished, quartz, rings, section, sectioned, silica, silicon dioxide, slice, stone, surface, thin section, thin slice, transmitted, variegated

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