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The largest crystal found in the cave measures over 11 ... which have created some of the most awe-inspiring natural ...

Discovered in 1999 inside an abandoned mine in Southern Spain, Pulpí Geode is the largest crystal 'cave' of its kind in the world. But what exactly is a geode and how do crystals form inside them?

"You can hold most of the crystals on earth in the palm of your hand," says ... Previously, the world’s largest examples of selenite crystals came from a nearby cavern discovered in 1910 within ...

You can see the zircon ages predicted by the early Earth model in the study in black in the chart to the right. The researchers predict that the zircon could have been created when the biggest ...

These rusted rocks tell when buried formations reached Earth's surface ... inside it holds hematite micro-crystals—the key to unlocking geochemical histories masked for eons.