TH FOTO-WERBUNG / SCIENCE PHOTO LIBRARY TH FOTO-WERBUNG / SCIENCE PHOTO LIBRARY
Agate. Section through a nodule of agate, a type of quartz (silicon dioxide). The colours are produced by impurities in the mineral. The concentric bands are formed as successive layers of quartz precipitate out of solution during the formation of the agate. Such agates are widely used as ornamental stones.
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