felspathoid

/F EH1 L S P AH0 TH OY0 IH1 D/

noun

1
Alternative form of feldspathoid. [(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

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