Chalcedony is a translucent microcrystalline type of quartz, the form of Quartz that is compact and formed of microscopic crystals. Botryoidal: havin

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Chalcedony is a translucent microcrystalline type of quartz, the form of Quartz that is compact and formed of microscopic crystals. Botryoidal: having a shape reminiscent of a cluster of grapes.

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Photo credit: © Phil Degginger / Alamy / Afripics
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