A tiny minority of stones are cystine stones, composed of the amino acid cystine which sometimes leaks into the urine to crystalize and form a yellow or light pink colored stone that is radiopaque under X-ray.
有部分结石是氨酸结石,是氨酸渗入尿液后结晶形成者淡粉的结石,在X线下是不透光的。