Crossword Genius

Source of iridescence in many mollusks (5)

Ross

I believe the answer is:

nacre

(Other definitions for nacre that I've seen before include "Mother-of-pearl from shellfish" , "Mother of pearl" , "Mother-of-pearl - crane (anag)" , "valuable material" , "Constituent of inlay furniture" .)

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.