Kidney Stone Calcium Phosphate Apatite. Hydroxyapatite is the hydroxyl endmember of the complex apatite group. They are caused by too much calcium in the urine too much phosphate in the urine or too little citrate in the urine.
The struvite calculi are formed of magnesium ammonium and phosphate. The less common way is the calcium phosphate type with calcium oxalates being more popularly encountered. The cause of calcium phosphate stones is often obscure but most often related to a high urine ph.
Calcium phosphate crystals phosphate ion and urine ph.
Curhan said that calcium phosphate stones are his least favorite type because they are difficult to prevent. Curhan said that calcium phosphate stones are his least favorite type because they are difficult to prevent. The basic cause is the supersaturation of calcium compounds in the urine. One oxygen atom has two lines for its bond to phosphorus.