Geodes, as anyone who has ever wandered through an ‘educational’ toy store knows, are minerals that have air pockets in which multicolored crystals grow.

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.

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 ...

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.

Similar to crystals, geodes are natural rock formations that some believe are able to hold different energies by balancing mood and calming stress, all while offering focus for meditation. Of course, ...