Seventy gallstones were studied by X-ray diffraction. The lithiasis component in the studied concretions is cholesterol. Cholesterol acquired two different forms - anhydrite and monohydrate. Calcium carbonates - vaterite, aragonite, and calcite - are also often found in the studied concretions. Vaterite was in 53 % of samples, calcite - in 25 %, and aragonite -in 18%.