The "big" one was the biggest, the broken one was like medium. There were different sizes, the biggest is there and a lot smaller ones were aplenty. They were all rounded, only the big ony is kind of blocky. The small broken one is probably the most common one, i'd say. But what the heck are these if not from liver?
BTW I'm 24 years old, so perhaps it takes longer for them to petrify.