power
(Ok I admit, I did mis-read it, but I didn't think it mattered anyway. This is Word Association which means you type the first word that comes to your mind. Since igneous looks alot like ingenious, the first idea that came to my mind was centered around intellect rather than stone

so I just instantly thought of "smart". I don't know, sorry, I'm not too familiar with the word igneous, but Word Association was supposed to be about typing the first word you think of, even if you don't necessarily know what the previous word means.)