Pronunciation: ˌ a-p ə - ' fi- ˌ l ī t, ə - ' pä-f ə - ˌ l ī t
Function: noun
Etymology: French, from apo- + Greek phyllon leaf ― more at BLADE
Date: 1810
: 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