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Geology in action at home. My pyrite is precipitating iron sulfate. If I add water, I can make sulfuric acid:

2FeS2 + 7O2 + 2H2O -> 2FeSO4 + 2H2SO4

Hang on, the weather has been is ridiculously humid. Could the acid have formed formed without direct water? Gosh, my house may be polluted with acid humidity.

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