Crossword Genius

Iridescent stone (4)

Ross

I believe the answer is:

opal

'iridescent stone' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for opal that I've seen before include "Milky stuff that's hard" , "Type of gem" , "Type of gemstone" , "precious jewel" , "Semiprecious stone of white and bluish colour" .)

I've seen this clue in The Wall Street Journal and the LA Times.
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