Formation of natural gypsum megacrystals in Naica, Mexico

@article{GarcaRuiz2007FormationON,
  title={Formation of natural gypsum megacrystals in Naica, Mexico},
  author={Juan Manuel Garc{\'i}a‐Ruiz and Roberto Villasuso and Carlos Ayora and {\`A}ngels Canals and Ferm{\'i}n Ot{\'a}lora},
  journal={Geology},
  year={2007},
  volume={35},
  pages={327-330}
}
Exploration in the Naica mine (Chihuahua, Mexico) recently unveiled several caves containing giant, faceted, and transparent single crystals of gypsum (CaSO4•2H2O) as long as 11 m. These large crystals form at very low supersaturation. The problem is to explain how proper geochemical conditions can be sustained for a long time without large fluctuations that would trigger substantial nucleation. Fluid inclusion analyses show that the crystals grew from low-salinity solutions at a temperature of… 
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  • P. Forti
  • Environmental Science
    Special Publications
  • 2017
Abstract The mine caves of Naica (Chihuahua, Mexico) are famous because they host large gypsum crystals. Mine works intersected new caves hosting the largest crystals in the world in the year 2000.
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TLDR
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The Geode of Pulpí (Almería, Spain) is an ∼11 m3 ovoid cavity, the walls of which are covered with meter-sized idiomorphic and highly transparent gypsum (CaSO4●2H2O) crystals. We performed a
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