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Slice of agate, a form of quartz

Slice of agate, a form of quartz

E425/0582

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Credit

VAUGHAN FLEMING / SCIENCE PHOTO LIBRARY VAUGHAN FLEMING / SCIENCE PHOTO LIBRARY

Caption

Agate. Slice through a nodule of agate, a type of chalcedony. This is a cryptocrystalline variety of the mineral quartz (silicon oxide). At the heart of the agate are rock crystals, a clear, colourless form of quartz. Impurities within agate can give the mineral a wide range of colours distributed in concentric bands. The bands represent successive layers of quartz precipitated out of solution. This occurs inside the circular cavities of lava rocks, producing rounded nodules. Fine specimens of agate are found in Brazil, Italy, Uruguay and Germany.

Release details

Model release not required. Property release not required.

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