Rock-forming mineral that makes up over half of the earth's crust (8)

I believe the answer is:

feldspar

(Other definitions for feldspar that I've seen before include "crystal" , "Large wading bird" , "Rock producer" , "Rock-forming mineral" , "Abundant mineral" .)

I've seen this clue in The New York Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.