Chalcedony is the gem name for cryptocrystalline quartz that forms from individual crystals so small that they cannot be seen even under an optical microscope. Agate, bloodstone, carnelian, chrysoprase, jasper, onyx, plasma, and sardonyx are all chalcedonies, but the term is typically used to refer to the white, gray, or blue forms of microcrystalline quartz.

Learn more about chalcedony.


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