Crack open an unassuming stone, and you might just uncover a little conclave of crystals within. Their walls are glittering with quartz, amethyst, or calcite, protected by a hard shell that was shaped ...

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 ...