Types of Gallstone

• Cholesterol gall stones. Yellow color gallstones contain undissolved cholesterol, although it may contain other components such as calcium and bilirubin (weak red blood cell remnants). 80 percent of gallstones are cholesterol stones.
• Pigmented gallstones. Small dark chocolate or black colored stones formed when there were too many bilirubin. It can be suffered by those who experience cirrhosis, biliary tract infection and sickle cell anaemia that produce excessive bilirubin.