Part of speech: noun

A mineral consisting chiefly of aluminum and silica. feldspath.

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Usage examples "feldspar":

  1. And now the acid, even without heat, dissolves not only the lime, but also so much of the silica of the feldspar as to form a transparent jelly. - "Familiar Letters of Chemistry", Justus Liebig.
  2. There was an occasional shelf where, with backs against the wall spotted with crystals of feldspar, they waited to breathe, hardly looking down from the dizzy ledge. - "Romance Island", Zona Gale.