Chalcedony - Crystal River Gems

Chalcedony

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      Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. It occurs in many different forms, colors, and patterns, and many varieties. "Chalcedony" is often used specifically to describe the white, gray, or blue translucent type of Chalcedony, but its technical term includes all additional varieties.
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