Agate is a mineraloid formed by chalcedony microcrystals. Polished samples have great ornamental value.

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Photo credit: © José María Barres Manuel / Alamy / Afripics
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Keywords: agata, agate, chalcedony, close-, color, gemstone, geology, horizontal, microcrystals, mineralogy, mineraloid, natural, ornamental, polish, polished, quartz, sample, translucent