Mineralogical studies of human urinary calculi from Natal.

Knowledge of the composition of human urinary calculi within a geographical area can lead to an understanding of the epidemiology of renal stone disease. Studies in the Durban area, with its high incidence of kidney and bladder stones, indicate that calcium oxalate is the overwhelmingly dominant (circa 80%) component, followed by uric acid. An important feature is the low occurrence of phosphate stones, especially those containing struvite.