Wikijunior:Let's Talk about Crystallization in the Naica Mine/2 - Naica Caves
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2 - Naica Caves | 3 - The Cave of Swords ![]() |
When the mine was being excavated, some amazing gypsum crystals were found in two natural underground caves. |
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/42/Ima.2_cristalls_de_Naica.jpg/500px-Ima.2_cristalls_de_Naica.jpg)