Crossword Genius

Type of rock formed from magma, for example (7)

Ross

I believe the answer is:

igneous

(Other definitions for igneous that I've seen before include "Type of rock from molten magma" , "Fire-formed rock" , "produced by fire" , "Like fire - type of rock" , "(Of rock) originating in molten state" .)

I've seen this clue in The Guardian.
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