feldspathoid

  1. 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.
  2. Adjective.  (mineralogy) Resembling a feldspar.

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This entry was last updated on RefTopia from its source on 3/20/2012.