Bismoclite (BiOCl) in the San Francisco de los Andes Bi–Cu–Au Deposit, Argentina. First occurrence of a bismuth oxychloride in a magmatic–hydrothermal breccia pipe and its usefulness as an indicator phase in mineral exploration

  title={Bismoclite (BiOCl) in the San Francisco de los Andes Bi–Cu–Au Deposit, Argentina. First occurrence of a bismuth oxychloride in a magmatic–hydrothermal breccia pipe and its usefulness as an indicator phase in mineral exploration},
  author={Fj Testa and David R. Cooke and Lejun Zhang and Graciela R. Mas},
The rare bismuth oxychloride, bismoclite (BiOCl), has been identified in the weathered tourmaline–cemented, magmatic–hydrothermal breccia complex at the San Francisco de los Andes Bi–Cu–Au deposit, Argentina. A wide variety of supergene minerals were detected in the oxidized zone, but only preisingerite (Bi3(AsO4)2O(OH)) is intimately associated with bismoclite. Bismuth arsenate is present either as minor accessory phases or as traces in bismoclite-rich samples. This is the first documented… Expand
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