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Chalcedony (pronunciation: /kælˈsɛdəni/) is a cryptocrystalline form of silica, composed of very fine intergrowths of Quartz and moganite. These are both silica minerals, but they differ in that quartz has a trigonal crystal structure, while moganite is monoclinic. Chalcedony's standard chemical structure (based on the chemical structure of quartz) is silicon dioxide.

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