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The name Apophyllite refers to a class of minerals with similar chemical makeup that comprise a solid solution series, and includes the members apophyllite-(KF), apophyllite-(KOH), and apophyllite-(NaF). This name, Apophyllite, is derived from the Greek ἀπόΦυλλίςο apophylliso, meaning “it flakes off”, a reference to this class’s tendency to flake apart when heated, due to water loss. These minerals are typically found as secondary minerals in vesicles in basalt or other volcanic rocks.
White Crystal Top, from India