I have not found one site anywhere that says calcium salts are ever excreted through the salt glands....every single site I have found says that lizards excrete potassium chloride and/or sodium chloride.
The last thing I think people need to do is read that the salts excreted are calcium salts and end up cutting down on the calcium supplements when they shouldn't. If someone has proof that its calcium, please post it!
Hugh Wahl - please read what kinyonga posted above you. I have never found evidence of it being more than excess salts either and we should be careful not to imply that calcium supplementation should be decreased.