Apophyllite. Sample of the hydrothermal mineral apophyllite, a general term for three separate minerals. They all consist of hydrated calcium, potassi

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Apophyllite. Sample of the hydrothermal mineral apophyllite, a general term for three separate minerals. They all consist of hydrated calcium, potassium and sodium silicates, fluorides and hydroxides. Apophyllite is found in cavities in rocks such as basalt.

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Photo credit: © Science Photo Library / Alamy / Afripics
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