Crossword Genius

Kind of rock produced under intense heat (7)

Ross

I believe the answer is:

igneous

(Other definitions for igneous that I've seen before include "Formed by fire like volcanic rock" , "(Of rock) originating in molten state" , "(Rock) set from lava" , "Maybe fiery" , "(Of rock) solidified from a molten state" .)

I've seen this clue in The Guardian.
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