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1 results

  • Marshite–miersile solid solution and iodargyrite from Broken Hill, New South Wales, Australia

  • P. W. Millsteed
  • Journal:
    Mineralogical Magazine / Volume 62 / Issue 4 / August 1998
    Published online by Cambridge University Press:
    05 July 2018, pp. 471-475

  • Microprobe analysis of marshite and miersite from Broken Hill, Australia, demonstrate extensive solid solution between the end-members CuI and AgI, indicating the possibility of a complete solid-solution series. Unit-cell parameters increase from 6.054 Å for marshite to 6.504 Å for miersite, closely following Vegard's Law. The Cu content of iodargyrite is generally below the limit of detection, but one zoned crystal contained 0.28 wt.% Cu. Crystallization of either miersite or iodargyrite at Broken Hill appears to be dependent upon the local availability and ratio of copper, silver and iodine ions.