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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.)
The various types differ in colour due to metallic impurities, such as iron, nickel, copper, and titanium present during crystallization.
It's calming, and speaks of spirit and trust.
Its name may be derived from the Greek port city of Chalcedon.
The ancient civilizations of Egypt, Greece and Rome used varieties of Chalcedony in jewellery and carvings, and, as gems of antiquity, they were believed to imbue their holders with certain powers.