Stilbite crystals in their host rock. Stilbite (calcium aluminium silicate) is a zeolite with a micro-porous, sieve-like, crystal structure. This prop

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Stilbite crystals in their host rock. Stilbite (calcium aluminium silicate) is a zeolite with a micro-porous, sieve-like, crystal structure. This property means that it can be used to separate hydrocarbons in the process of petroleum refining. Specimen found in Bernfjord, Iceland.

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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