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

同磷酸钙结石一样，鸟粪石是灰白色的，在X线片上是不透光的。

Sometimes, instead of oxalate, the calcium binds a negatively charged phosphate group to form calcium phosphate stones, which are dirty white in color and alsop radiopaque on an Xray.

有时候，钙离子与带负电荷的磷酸基团结合而非草酸，形成的磷酸钙结石呈灰白色，也在x线片上显影。