It's geodes galore at Tulip City Gem and Mineral Club's annual rock, mineral and jewelry show taking place this weekend. This makes sense since the theme of this year's show is “Geodes — Hidden ...

Iowa’s state rock is all over the state’s southeast corner, but to find one you need to know someone. “There’s tons of geodes over here, but nobody has opened it up to the public,” said Kirk ...

Forbes contributors publish independent expert analyses and insights. David Bressan is a geologist who covers curiosities about Earth. Discovered in 1999 during mining operations in the Mina Rica (the ...