cow gallstones

Gallstones are usually round, triangular, or square in shape, vary in size and are usually a yellowish-red to brown-orange in color.The most common type of gallstone, called a cholesterol gallstone, often appears yellow in color. These gallstones are composed mainly of undissolved cholesterol, but may contain other components. Pigment gallstones. These dark brown or black stones form when your bile contains too much bilirubin