Page last updated at 18:38 GMT, Monday, 18 January 2010

Rare footage of crystal cave


Mexico's Cave of Crystals stunned geologists when it was first discovered in 2000.

The underground chamber contains some of the largest natural crystals ever found - some of the selenite structures have grown to more than 10m long.

Professor Iain Stewart got a rare glimpse of the subterranean spectacle while filming for the new BBC series How the Earth Made Us.

How the Earth Made Us: The epic story of how geology, geography and climate have influenced mankind is on Tuesday 19th January on BBC Two at 2100 GMT


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