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The brief notes for this object detail that the calculus measures 69mm diameter at the widest point and is made of uric acid. A build up in uric acid can be caused by a diet high in purines, which are found in high amounts in animal protein, especially red meat. The appearance of the calculus shows it to be smooth, oval and mounted in a leather case. This is one of several calculi from the collections, which include a bladder calculus weighing 6.25kg, alleged to have come from an elephant.