Type of rock formed by the solidification of molten magma (7)

I believe the answer is:

igneous

(Other definitions for igneous that I've seen before include "(Rock) set from lava" , "Type of rock from molten magma" , "Fire-formed rock" , "Formed by fire like volcanic rock" , "(Of rock) solidified from a molten state" .)

I've seen this clue in The Independent.

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