Feldspathoid meaning

fĕld-spăthoid, fĕl-
Any of a group of relatively rare minerals that are chemically very similar to feldspars, but have too little silica to qualify as feldspars.
noun
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Any of a group of relatively rare minerals that are chemically very similar to feldspars, but have too little silica to qualify as feldspars. Feldspathoids occur in igneous rocks with little or no silica.
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Origin of feldspathoid

  • feldspath (obsolete variant of feldspar) (from obsolete German Feldspath feldspar feldspar) –oid

    From American Heritage Dictionary of the English Language, 5th Edition