It's a joke. The joke is that there are people who believe rocks have magical auras that aren't backed by science, so the first poster here is joking that there ARE rocks with "auras" - uranium has an unseen attribute affecting the world around it (an "aura") but the effect it has is causing cancer.
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The other posters are riffing on that joke and the idea of magic being caused by rocks, in very silly ways.
...or at least there will *be* cursing. Of a sort.