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  • Do quartz rocks affect pH? | Yahoo Answers

    Jun 29, 2014 · Best Answer: Quartz, the second-most abundant mineral on earth, is all but insoluble in water (the glass your aquarium is made of will actually dissolve faster). Therefore, it has no measurable effect on the pH of aquarium water. As Punkin Eater says, though, there is a possibility that there are inclusions (contaminants, more or less) in the quartz rock, such as metals or other minerals, that ...