Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of a group of relatively rare minerals that are chemically very similar to feldspars, but have too little silica to qualify as feldspars.

from The Century Dictionary.

  • noun Feldspar or some other species (nephelite, sodalite, leucite, and the scapolites) which plays a similar part in the composition of rocks.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy Any of a small group of igneous, plutonic, and volcanic minerals formed in magma that did not contain enough silica to satisfy all the chemical bonds. Feldspathoids are silica-poor variants of the feldspar group.
  • adjective mineralogy Resembling a feldspar.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[feldspath (obsolete variant of feldspar, from obsolete German Feldspath, feldspar; see feldspar) + –oid.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Feld, field (from Middle High German veld, from Old High German feld) + Spath, spar + Oid, like or resembling.

Examples

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