apophyllite Meaning, Definition & Usage

A*poph"yl*lite noun
Etymology
Pref. apo- + Gr. leaf; so called from its foliated structure or easy cleavage.
Definitions
  1. (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.

Webster 1913