Agates - Hutchinson encyclopedia article about Agates Printer Friendly
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agate
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agate

Cryptocrystalline (with crystals too small to be seen with an optical microscope) silica, SiO2, composed of cloudy and banded chalcedony, sometimes mixed with opal, that forms in rock cavities.

Agate stones, being hard, are also used to burnish and polish gold applied to glass and ceramics and as clean vessels for grinding rock samples in laboratories.
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