These, the team explained, are a type of solid mineral concretions that form in the body naturally under certain conditions — and include stomach, bladder, gall and kidney stones. Calculi have previously been discovered within ancient Egyptian mummies, but they are rare in the fossil record.... More infoSUBSCRIBE Invalid email We use your sign-up to provide content in ways you've consented to and to improve our understanding of you.... This may include adverts from us and 3rd parties based on