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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.