apophyllite
A*poph"yl*lite, n. Etym: [Pref. apo- + Gr. (Min.) Defn: 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.
A*poph"yl*lite, n. Etym: [Pref. apo- + Gr. (Min.) Defn: 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.