DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Natrolite crystals. Slender, radiating crystal needles (white) of the mineral natrolite. This mineral, a tectosilicate (Na2Al2Si3O10), belongs to the zeolite group of minerals. Like most zeolites, natrolite occurs in cavities or open cracks in basaltic igneous rocks. This sample is 10 centimetres across.
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