<prompt> Stone formed in alkaline urine is:Calcium oxalateCalcium phosphateCysteineUric acid  <response>: Struvite stones infection stones - Composed of calcium, ammonium, magnesium phosphate Triple phosphate stones. Tend to grow in alkaline urine, especially with Proteus infection and fill whole of the pelvi-calyceal system, forming staghorn calculi. Formed In high urinary concentration of ammonia. More common In women Increased susceptibility for UTI Increased tendency to form struvite calculi Is seen In: Foreign body In the urinary tract Foleys catheter and neurogenic bladder Bladder dysfunction Bladder outlet obstruction. 