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Memory Alpha

Explosive mineral formations encountered by the Enterprise crew on the planet Gamma Trianguli VI contained uraninite, hornblende and quartz. It was extremely fragile, had good cleavage, and was unstable. (TOS: "The Apple")

Spock notes in this episode that these minerals could be a find of some importance, given that it could be a considerable power source in large quantities. This statement leads directly to speculation that the minerals might be a power-source for Vaal, since nothing else available on the planet would seem to have enough energy content to satisfy the appetite of a machine such as it. On the other hand, based on the explosions seen in the episode, it is doubtful that the rock contains much more potential energy than petroleum.
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