A geode observed in thin section, photographed with transmitted, polarized light, reveals the details of the precipitation and crystallization of sili
A geode observed in thin section, photographed with transmitted, polarized light, reveals the details of the precipitation and crystallization of silica in a rock void. Geodes form when chalcedony (silica, SiO2) precipitates from liquids percolating inside an empty void or crack in a host rock. The peripheral layers here formed are amorphous to sub-crystalline silica, while the core is made up of crystalline quartz. Actual width is 44 mm
Size: 4972px × 3552px
Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: -crystalline, amorphous, chalcedony, concentric, cracks, crystalline, crystals, dioxide, earth, geode, geology, micrograph, mineral, mineralogy, percolating, polarisation, precipitation, rock, rocks, science, section, semi-precious, silica, silicon, thin
