Like the calcium phosphate stones, struvite stones are dirty white and radiopaque under an X-ray.

钙一样，鸟粪是灰白色的，在X线片是不透光的。

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.

有一小部分是胱氨，是胱氨渗入液后晶形成黄色或者淡粉色的，在X线下是不透光的。