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Figure 3
Mexico's Cueva de los Cristales (Cave of Crystals) contains some of the world's largest known natural crystals of gypsum (as long as 11 m). `They are the Sistine Chapel of crystallography', according to Juan Manuel García-Ruiz (García-Ruiz & Trueba, 2009 ). Source: The Giant Crystal Caves of Naica, copyright Madrid Scientific Films 2009, photograph Javier Trueba. |


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