Magnesium ammonium phosphate, MgNH 4 PO 4.6H 2 O, is found as the mineral struvite and in some guanos; it occurs also in urinary calculi and is formed in the putrefaction of urine.
The second most common type, accounting for 6-20% of renal stones, is formed from struvite (magnesium ammonium phosphate ).
Dietary components have been implicated to be important in the development and management of struvite and calcium oxalate uroliths in cats.
For example, pets with hypertension or struvite urolithiasis should not be given water with high sodium or magnesium concentrations, respectively.