RAY SIMONS / SCIENCE PHOTO LIBRARY RAY SIMONS / SCIENCE PHOTO LIBRARY
Agate. Close-up of the cut face of agate stone showing marble-like patterns. Agate is a type of chalcedony, a crypto-crystalline variety of the mineral quartz (silicon oxide). The presence of impurities can give it a wide range of colours which may be distributed in regular bands or zones, in clouds or in dendritic forms.
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