53.4 MB (2.2 MB compressed)
5197 x 3590 pixels
43.9 x 30.5 cm ⏐ 17.3 x 12.0 in (300dpi)
DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
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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