Onyx Gemstone

By:  Olivia Luz

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Agate and onyx are both varieties of layered chalcedony that differ only in the form of the bands. Meanwhile black onyx even gets a special place in the field of metaphysical theories related to gemstones. Onyx is a variety of the microcrystalline quartz called chalcedony the name chalcedony comes from calcedon or calchedon an ancient port on the sea of marmara in asia minor.