What is the source of chemicals for their formation in the human body of gull-stones and kidney-stones?

Gallstones primarily form from imbalances in the substances that make up bile, including cholesterol, bile salts, and bilirubin. Excess cholesterol can crystallize in the gallbladder, leading to stone formation. Kidney stones, on the other hand, typically arise from the crystallization of minerals and salts, such as calcium, oxalate, and uric acid, due to factors like dehydration, dietary habits, and metabolic disorders. Both types of stones can result from a combination of genetic, dietary, and lifestyle factors that influence the concentration of these substances in the body.