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)
Simple, because those greenish lumps do not have the properties of real gallstones and lab analysis has PROVEN over and over that those squishy green blobs are primarily saponified olive oil, not gallstones.