One of the three main types of rock (7)

I believe the answer is:

igneous

(Other definitions for igneous that I've seen before include "Like fire - type of rock" , "Category of rock, being of solidified molten magma" , "Of fire, fiery" , "(Of rock) originating in molten state" , "Formed of solidified magma" .)

I've seen this clue in The Times.

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