Amethyst filled geode. Crystals of amethyst (purple) filling the void of a geode. Amethyst is a violet coloured variety of quartz (silicon dioxide) th

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Amethyst filled geode. Crystals of amethyst (purple) filling the void of a geode. Amethyst is a violet coloured variety of quartz (silicon dioxide) that is often used in jewellery. Geodes form when minerals precipitate from liquid onto the inside surface of an empty pocket in a host rock. Here the outer rock is formed by quartz crystals (colourless to grey) and portions of banded agate in various colours.

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Size: 5125px × 3417px
Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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