noun apo·phyl·lite \ˌa-pə-ˈfi-ˌlīt, ə-ˈpä-fə-ˌlīt\

Definition of apophyllite

  1. :  a mineral composed of a hydrous silicate of potassium, calcium, and fluorine that is related to the zeolites and is usually found in transparent square prisms or white or grayish masses

Origin and Etymology of apophyllite

French, from apo- + Greek phyllon leaf — more at blade

First Known Use: circa 1807

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