Natrochalcite: Hydrated Sodium Copper Sulfate Hydroxide  
  Krohnkite: Hydrated Sodium Copper Sulfate  
  Chuquicamata (Calama) Chile, Antofagasta Province  

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  picture, make a donation of $25 or more and include the  
  photo number ("Krohnkite #7482") and your mailing  
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