MARTIN LAND / SCIENCE PHOTO LIBRARY MARTIN LAND / SCIENCE PHOTO LIBRARY
Apophyllite crystals. Apophyllite is a general term for three separate minerals. They all consist of hydrated calcium, potassium and sodium silicates, fluorides and hydroxides. The most common form has a tetragonal structure. Apophyllite is a hydrothermal mineral found filling cavities in rocks such as basalt. This specimen is from Poona, India.
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