Variety of rock (7)

I believe the answer is:

igneous

(Other definitions for igneous that I've seen before include "Produced by the action of intense heat" , "Category of rock, being of solidified molten magma" , "Formed of solidified magma" , "(Of rock) originating in molten state" , "(Of rock) solidified from lava or magma" .)

I've seen this clue in The Sun.

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