DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Geode. Macrophotograph of the cut and polished surface of a sectioned geode. A geode is a hollow rock in which layers of crystals have been deposited over time. The solution from which the crystals precipitated entered through a small hole at upper right. The mineral found in geodes is usually agate, a form of chalcedony. This is a type of quartz. Magnification: x2.5 at 4x5" size.
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