apophyllite

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

Definition of apophyllite 

: 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

First Known Use of apophyllite

circa 1807, in the meaning defined above

History and Etymology for apophyllite

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

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The first known use of apophyllite was circa 1807

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Britannica.com: Encyclopedia article about apophyllite

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