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Cave scientist Penny Boston: Why I hugged a hot mega-crystal. Photo by M. Spilde

Duration: 00:41

Penny describes her emotional reaction to having to leave the Naica cave system in Mexico, where the largest crystals on earth dwell in 50 degrees centigrade heat, 300 metres underground.

Available since: Thu 25 Jul 2013

This clip is from

The Forum Shining a Light on Crystals

Crystals are found growing naturally all over the world, so why are we creating new ones?

First broadcast: 27 Jul 2013

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