<prompt> Gallstones do not contain:OxalateCholesterolPhosphateCarbonate  <response>: Gallstones In the USA and Europe, 80 are cholesterol or mixed stones, whereas in Asia, 80 are pigment stones Cholesterol or mixed stones - 51-99 pure cholesterol Pigment stone contains 30 cholesterol Black stones - Insoluble bilirubin polymer calcium phosphate calcium bicarbonate Brown pigment stones- calcium bilirubinate calcium palmitate calcium stearate cholesterol 