due to the fact that these crystals are younger and had been growing for much less time by the time they were discovered in 1910. Gallery References External links Naica mine at Peñoles Naica Mine at Mindat.org Naica Project, comprehensive website on the Crystal Caves with geology, history, photos and videos Let's Talk about Crystallization in the Naica Mine, at Wikijunior books for children. Caves of Mexico Lead mines in Mexico Zinc mines in Mexico Silver mines in Mexico Underground mines in Mexico Geography of Chihuahua (state) Landforms of Chihuahua (state) pl:Kryształowa Jaskinia w Naica