Dangerous Goods, you seem to unfailingly misread my posts so I don't see the point in trying to get you to understand.
Don't you think its reasonable that a stone found in the gallbladder is a gallstone? The paper was looking at the composition of Gallstones which is known can vary. However Gallstones are never made of potassium carboxylates, are not soft, and do not melt at 40 degrees!