Oxalate stones in your kidneys  Envelope shaped Calcium oxalate crystals Written by Dr harold Gunatillake –Health writer As you grow up you could manufacture stones (calculi) in your body, such as in organs like the gall bladder, kidneys and so on. Our discussion today is about kidney stones emphasis on oxalate stones. Most kidney stones include calcium stone which are radio-opaque and seen on plain X rays. They are mainly oxalate stones a naturally occurring substance in food-vegies fruits nuts, chocolate and so on as oxalic acid. One cannot pin-point the cause or causes that create kidney stones. Taking too much of calcium do not produce calcium oxalate stones, either. These stones form when your urine contains more crystal-forming substances that you eat. High doses of taking vitamin D supplements, intestinal bypass surgery and several metabolic disorders can increase the concentration of calcium or oxalate in urine. ...