Keokuk geodes attract rock-hunting hobbyists from all over, but just how easy is it to find one? “As a young kid, we used to go to the Mississippi over there and go fishing,” Mike Shumate recalled.

Göttingen University researcher Fiorella Arduin Rode working in open pit mine of the study area, Los Catalanes mining district, northern Uruguay. Along with Ametista do Sul in southern Brazil, these ...

Rosie is a freelance writer living in London. She has covered everything from ancient Egyptian temples to exciting medical breakthroughs, but she particularly enjoys writing about wildlife, ...