According to everything I've seen online, cholesterol stones are a form of gallstone. I don't know why everyone is so hellbent on claiming that the greenish-yellow lumps that most of us expel during Liver Flushes are not 'true' gallstones. (Not directed at you, just stating generally)
"The two types of Gallstones are cholesterol stones and pigment stones. Cholesterol stones are usually yellow-green and are made primarily of hardened cholesterol. They account for about 80 percent of gallstones. Pigment stones are small, dark stones made of bilirubin. Gallstones can be as small as a grain of sand or as large as a golf ball. The gallbladder can develop just one large stone, hundreds of tiny stones, or a combination of the two."