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55.9 MB (2.1 MB compressed)
5331 x 3662 pixels
45.2 x 31.0 cm ⏐ 17.8 x 12.2 in (300dpi)
DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Amethyst filled geode. Crystals of amethyst filling the void of a geode formed by layers of chalcedony. Amethyst is a violet coloured variety of quartz (silicon dioxide) that is often used in jewellery. This geode is roughly the size of a tennis ball.
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