The secret world of minerals has always fascinated man. The film is about this passion and the almost obsessive hunt for the small jewels of the mountain. An expert tell us how the crystals are formed and classified and what you must know about the mountains to find them. In the most important part of the film we accompany a seeker to an unusual place, in the tunnels of Grimsel power station where, in the depths of the mountain, you can find world rarities and marvels of nature: a naturla museum now protected and discovered thanks to a number of fortunate circumstances