Apophyllite
Apophyllite is a collective name for a group of phyllosilicate minerals, including the members fluorapophyllite, hydroxyapophyllite and natroapophyllite. These minerals are mostly found in igneous rock environments. They are popular with mineral collectors but have no industrial use. This sample shows prismatic crystals of fluorapophyllite on a substrate of microcrystalline stilbite, a tectosilicate mineral that belongs to the zeolite group of minerals. Actual width of specimen is 120 mm. Provenance is Pune (Poona) district of Maharashtra, India., by DIRK WIERSMA/SCIENCE PHOTO LIBRARY
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