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1 results

  • Crystal structure of austinite, CaZn(AsO4)OH

  • Lori A. Clark, Joseph J. Pluth, Ian Steele, Joseph V. Smith, Stephen R. Sutton
  • Journal:
    Mineralogical Magazine / Volume 61 / Issue 408 / October 1997
    Published online by Cambridge University Press:
    05 July 2018, pp. 677-683

  • Austinite belongs to the adelite mineral group of calcium and lead arsenates, and has the conichalcite/descloizite type of crystal structure. The crystal structure of nearly pure austinite, CaZn(AsO4)OH, was redetermined (R = 0.014) and the absolute configuration identified. The space group P212121 and cell parameters a 7.5092(8), b 9.0438(9), c 5.9343(8) Å match previous data. Zinc octahedra share edges to form chains parallel to c. Arsenic tetrahedra share vertices with the Zn octahedra to generate a compact framework. Calcium square antiprisms share edges to make chains parallel to a that occupy the channels in the zinc-arsenic framework.