Polished agate surface

Polished agate surface

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Credit: JEAN-CLAUDE REVY, ISM/SCIENCE PHOTO LIBRARY

Caption: Agate surface. Cut and polished agate surface with colourful patterns formed from mineral impurities that were trapped as the agate formed. Agate is silica (silicon dioxide) that precipitated from liquid inside existing rock. The patterns are revealed by erosion or cutting the rock open and polishing the exposed surface. Pieces of polished agate are prized as ornaments. This piece of agate is from Madagascar.

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Keywords: africa, african, agate, close-up, cut, detail, earth science, geological, geology, green, madagascan, madagascar, mineral, mineralogy, ornamental, pattern, patterns, polished, quartz, sample, silica, silicon dioxide, surface

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