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.

The geode of Pulpí was discovered in 1999 in the Mina Rica silver mine in southeast Spain. The walls of the cave are covered with huge crystals that are so transparent they look like blocks of ice.

An abandoned mine in Spain hides a sparkling treasure – the world's largest geode, a natural crystal phenomenon that has stunned scientists. In abandoned silver mine in Pulpí, in Spain's south ...

Large crystals found in geodes and other rocks are relatively rare. Mineral Photos. 1 of 11. Pink Chalcedony A pink chalcedony shows off its beauty.

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 ...