Crystal cave of giants in the Naica Mine, Mexico

This is the crystal cave of giants found in the Naica Mine, Chihuahua, Mexico. These are Selenite crystals (gypsum) and are the largest crystals ever discovered...

They are 1000 feet down in a limestone host rock where they are mining for lead, zinc and silver.

These crystals were formed by hydrothermal fluids emanating from the magma chambers below.

The miners had to drill through the Naica fault, which they were worried would flood the mine, and this is what they discovered.

Selenite is one of the most beautiful varieties of gypsum, being a mineral composed of calcium sulfate hydrate (CaSO4•2H2O) it quite often forms compact and lucid laminate aggregations. It sometimes presents itself in the shape of giant crystals with perfect laminate exfoliation, and amazing reflectivity. The Naica caves are the greatest expression of magnitude and beauty in the world.

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