DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Calcite (CaCO3) has precipitated from a watery solution in cavities or caves, most probably in rocks of a calcareous nature, like limestone. These bulbous precipitates are much similar to stalactites and stalagmites, the well known "drip-stones" found in caves.
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