Apophyllite on calcite

Apophyllite on calcite

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Apophyllite on calcite. Close-up of calcite (calcium carbonate) crystals (large, square) covered in smaller apophyllite crystals (sugar-like). This is an example of a pseudomorph, the occurrence of a mineral in a crystal system or habitat other than its own. Apophyllite is a hydrothermal mineral usually found filling cavities in igneous rocks such as basalt. It is a general term for the three separate minerals fluorapophyllite, hydroxyapophyllite, and natroapophyllite. Specimen measures 85mm in diameter.

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