Spain’s crystal cave, the giant gypsum geode of Pulpí

Take a video field trip to La Geoda de Pulpí, the giant Pulpí Geode located in Mina Rica, an abandoned lead, iron, and silver mine in Spain. The 11 cubic meter (390 ft³) crystal cave boasts 2 meter (over 6 foot) long translucent crystals made of selenite gypsum. In the...