From what I learned(maybe I was wrong), When the amount of bile salts(or lecithin) in bile is inadequate to solubilize the cholesterol it contains or when cholesterol levels are excessive, cholesterol may crystallize, forming gallstones, or biliary calculi, which obsturct the flow of bile from the gallbladder or its duct contracts, the sharp crystals cause agoniaing pain.
I would like to learn from the different view but Gallstones which I think is really Gallstones should be crystallized.