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Technically, chalcedony (kal SED' uh nee) is any form of microcrystalline or cryptocrystalline quartz, (meaning any form of quartz whose crystals are too small to be seen without high magnification.) In common practice, only the translucent, single color types are sold as "chalcedony" whereas the rest of this group are sold under individual variety names, or as jasper or agate. While the definitions overlap, jasper usually refers to an opaque, solid colored stone. Agate is defined either by its translucency, or by having a pattern to its colors.
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