ˌapəˈfiˌlīt, əˈpäfəˌl- noun
( -s )
Etymology: French, from apo- + phyllite
: a mineral KCa 4 Si 8 O 20 (F,OH).8H 2 O composed of a hydrous potassium calcium silicate related to the zeolites and usually occurring in transparent square prisms or white or grayish masses (hardness 4.5-5, sp. gr., 2.3-2.4)