(Of rock) formed from solidified lava or magma (7)

I believe the answer is:

igneous

(Other definitions for igneous that I've seen before include "(Of rock) solidified from a molten state" , "Like fire - type of rock" , "Formed by fire like volcanic rock" , "(Of rock) solidified from lava or magma" , "Produced by intense heat, rocks say" .)

I've seen this clue in The Times.

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