How is mineral supersaturation in urine defined?

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Binnur Tüzün

you can observe the ca oxalate crystals in urine sediment with light microscopy. This phenomenon may be linked increased parathormone.

Joseph Skulan

I understand that all urine is supersaturated with respect to Ca oxalate, so that you can expect oxalate crystals to form over time. The question is where the saturation concentrations of dissolved Ca and oxalate in urine are assumed to be the same as those of pure water at the same T and pH?