Cut and polished agate

Cut and polished agate

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Caption: Cut and polished agate. This agate formed following precipitation of chalcedony (coloured) and quartz (white) inside cracks or voids in a rock. Both are forms of silica. The coloured parts are tinted by impurities of some metallic element, like copper or iron. Although the chalcedony is non-crystalline, it has precipitated in a semi-crystalline dendritic (branch-like) pattern.

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