DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Copper and iron mineral deposits. The blues and greens are aresult of hydrothermal deposition. This means that the azurite (blue) and malachite (green) precipitated from a hot, aqueous solution. The reds are of the volcanic host rock, on which the above minerals were deposited. Actual height: 24 centimetres.
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