Unlike the giant crystal cave of Naica in Mexico, where mineralogists were able to study a still active crystal cave, the crystals in the geode of Pulpí stopped growing almost 60.000 years ago.

The crystal columns at Pulpí are made of gypsum — the product of water, calcium sulfate, and lots and lots of time — but not much else has been revealed about them since the geode's ...

These human-size crystals formed in especially strange ways. New clues into ancient climate shifts reveal the possible origin story of Spain's Pulpí Geode, one of the world's largest.

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 ...