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Acicular blue crystals in little vugs. Not obvious in the picture at this resolution, but the best group is at the lower left. Martix is interesting... appears to be a sulfide like Chalcostibite or Bismuthinite, neither of which are documented at this location, nor consistent with chemistry of Guanacoite. From El Guanaco Mine, Santa Catalina, Antofagasta Province.
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