A*poph"yl*lite (&?;), n. [Pref. apo- +
Gr. &?; leaf; so called from its foliated structure or easy cleavage.]
(Min.) A mineral relating to the zeolites, usually occurring in
square prisms or octahedrons with pearly luster on the cleavage surface. It
is a hydrous silicate of calcium and potassium.