Agate

Agate is formed in a void by the precipitation from ground water of minute crystals of quartz growing into and often filling the void. The varied and brilliant coloring of agate is produced by trace amounts of impurities such as copper or iron that are also brought in by groundwater. The banding seen in many agates reflects changes in the type of impurity as the process continues. Agate is found in numerous locations throughout the world. The Brazilian agates in the Jacklin Collection are considered choice specimens.

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