This is the Crystal Cave of Giants found in the Naica Mine, Chihuahua, Mexico.
These are Selenite crystals (fossilized gypsum) and are the largest crystals ever discovered!
They are 1000 feet down in a limestone host rock where the owners of the Naica mine in Mexico are mining for lead, zinc and silver.
The Naica caves are one of the most awe-inspiring expressions of Earth's abilities and beauty in the world.
Some of these natural selenite crystals are more than 4 feet wide and 50 feet long!
The crystals were formed by hydrothermal fluids emanating from the magma chambers below.
For more information about this wondrous cave, see the following links:
Colossal Crystal Caves Uncovered
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