What does the word feldspar mean?

Usage examples for 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 by 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 by Zona Gale