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SEM imagery of botryoidal silica structures. (A) A secondary electron image (10 kV) of botryoidal silica precipitate from a sinter sample collected from Steep Cone hot spring in Yellowstone National Park. (B) ET-detector image (20 kV) of silica which precipitated on a microscope slide after 1 week in the hot spring simulation chamber (abiotic), displaying the same botryoidal texture characteristic of silica precipitation.
