apophyllite

1 definition found

apophyllite - Collaborative International Dictionary of English v.0.48 :

  Apophyllite \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.
     [1913 Webster]