Stone can be formed in any organ that is storing body secretion such as saliva, urine, digestive enzymes.
Kidneys and Gall bladder are common organs to form stones.
As name suggest, Kidney stone occurs in urinary system (kidney, ureter, and bladder) and Gall bladder stones occurs in Gall bladder (“pittaashay”). Cause, symptoms, treatment and complications are very much different. One should not be confused with other.