DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Geode. Close-up of the surface of a sectioned geode. A geode is a hollow rock in which layers of crystals are deposited from a solution that fills the central cavity. This geode is rich in rhyolite, a rock formed from cooling magma. Magnification: x3 at 4x5 inch size.
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