DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Mesolite is a hydrated sodium calcium aluminum silicate, a tectosilicate mineral that belongs to the zeolite group. It is closely akin to other zeolite minerals like natrolite and scolecite and much similar in appearance. Its acicular (needle-like) and often radiating white crystals are formed inside voids left by gas bubbles in cooling volcanic rock. Specimen measures 50 mm across, origin unknown.
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