Agate nodule

Agate nodule

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Credit: DANIEL SAMBRAUS/SCIENCE PHOTO LIBRARY

Caption: Agate nodule. Polished slice of the surface of an agate nodule. The outer banded layers are chalcedony (amorphous or non-crystyalline silica). Quartz is the crystalline form of silica, which is at the centre of the slice.

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Keywords: agate, banded, chalcedony, cryptocrystalline, crystals, geode, geological, geology, mineral, opal, polished, quartz, silicon dioxide, surfcace

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