[feld-spath-ik, fel-, feld-spath-, fel-]
adjective Mineralogy.
of, pertaining to, or containing feldspar.
Also, felspathic, feldspathose, felspathose.

1825–35; < German Feldspath (see feldspar) + -ic

nonfeldspathic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
feldspathic   (fěld-spāth'ĭk, fěl-)  Pronunciation Key 
Relating to or containing feldspar.
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