Most calcium oxalate stones have a certain amount of calcium phosphate material in them. However, if a kidney stone is made up of more than fifty percent calcium phosphate, you will be treated specially for that type of stone. Uric acid stones are much less common than calcium oxalate stones. Sometimes they are made up of pure uric acid, and sometimes they form as a mixture of uric acid with calcium oxalate. Your body makes uric acid when it breaks down RNA and DNA as a normal body function.
Uric acid can crystallize into stones when the urine is persistently acid.
If the urine can be made to be less acid sometimes with dietary changes, including medication uric acid stones can dissolve. People get acid urine from heredity, a disposition to gout , renal disease, intestinal disease, and overuse of certain foods, including meat. They always result from infection. During a urinary infection, certain bacteria can break down urea, which is a component of urine, into ammonia. This makes the urine surrounding the bacteria extremely alkaline, so that the magnesium and phosphorus normally present in the urine form crystals with the ammonia.