Natrolite crystals. Slender crystals of the mineral natrolite (white) in their phonolite host rock (grey). Natrolite (hydrated sodium and aluminium si

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Natrolite crystals. Slender crystals of the mineral natrolite (white) in their phonolite host rock (grey). Natrolite (hydrated sodium and aluminium silicate) is a tectosilicate that belongs to the zeolite group of minerals. Like most zeolites, natrolite occurs in cavities or open cracks in rocks. Phonolite is a rare extrusive volcanic rock. This sample is from the Ore Mountains, Germany, and measures 150mm wide.

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Size: 5197px × 3590px
Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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