Millions of years of percolating water and geological dumb luck created Crystal Cave, an uncannily pristine chamber beneath a Lake Erie island. When a winemaker accidentally drilled into it, one of ...

The geode of Pulpí is an 11-meter hollow ovoid with crystal-paneled walls. It is like those familiar couplets of stone interiors covered with bright crystallites, but so large that several people can ...

From one end to another, this giant geode is about as long as a small RV. If you wanted, you could comfortably house several adults within its dazzling interior. And the crystalline slabs that jut ...

Real geodes are handball-sized, hollow rocks that start out as bubbles in volcanic or sedimentary rock. Only when these inconspicuous round rocks are split in half by a geologist, do we get a chance ...