There are also uric acid stones which are red-brown in color and radiolucent under an Xray, meaning that they're transparent to x-rays and don't show up very well.
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.
Alright, as a quick recap, pulmonary edema refers to fluid accumulation in the interstitial space of the lungs which can be seen on a chest Xray or chest CT scan.