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feldspathoid

noun feld·spath·oid \ -ˌthȯid \
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Definition of feldspathoid

plural -s
: a mineral consisting of an aluminous silicate (as leucite nepheline) that has too little silica to form feldspar
—

feldspathoidal

adjective

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Origin and Etymology of feldspathoid

International Scientific Vocabulary feldspath + -oid

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