In the mine of Naica which is a lead, zinc and silver mine, are incredible selenite crystals that measures 4ft. in diameter, and 36 ft. long and they are the largest natural crystals ever found. This chamber or cave of giant crystals is approximately 1,000 feet (300 m) down in the limestone host rock of the mine. The selenite crystals were formed by hydrothermal fluids coming from the magma chambers below. The cavern was discovered by accident when miners were drilling through the Naica fault.
Geologists say that there is a magma chamber two to three miles below the mountain and the heat from this compressed lava travels through the faults up into the area of the mine. The heated fluids form the crystals. Get to more about this incredible crystal cave. Read more.
***All images used are from Google Images
