feldspar

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium

Partial calque of German Feldspat, formed from Feld (“field”) + Spat (“spar”), the second element replaced with the English cognate spar.

It was made of black, glassy lava mixed with bits of feldspar. — Twenty Thousand Leagues Under the Seas: An Underwater Tour of the World, Jules Verne
It occurs in the various feldspars and feldspathic rocks, and in mica. — Commercial Geography: A Book for High Schools, Commercial Courses, and Business Colleges, Jacques W. (Jacques Wardlaw) Redway
It was at this epoch that the rocks called feldspars, syenites, and porphyries appeared. — A Journey to the Centre of the Earth, Jules Verne

felspar

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