A 26,000-pound amethyst geode would not be without precedent, either: According to the Guinness Book of World Records, the largest amethyst geode (just shy of 10 feet tall) weighs 28,660 pounds.

Amethyst geodes—some stretching 5 m long—dot the ancient lava flows of Uruguay’s Los Catalanes mining area. The geodes contain calcite, colorless quartz, and agate, another quartz mineral.

The geode of Pulpí is thought to have formed between 600,000 and 2 million years ago. Hector Garrido Exactly when the geode of Pulpí formed is not known, but it was at some point after the ...

Colossal crystals, gigantic geodes: Selling ‘mind-boggling’ collection no easy task Originally published February 27, 2016 at 8:00 am Updated February 27, 2016 at 12:48 pm ...

“To me, the giant crystals of Naica, or the geode of Pulpí, are like the Egyptian pyramids,” García-Ruiz says. All are remarkable monuments, but those geodes are eons in the making and are ...

A giant among geodes Any geode might make us wonder: What geologic forces form these hollows lined with crystals? But the Pulpí Geode, discovered in an abandoned Spanish mine, takes wonder to a ...