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2 results

  • The crystal structure of ceruleite, CuAl4[AsO4]2(OH)8(H2O)4, from Cap Garonne, France

  • Stuart J. Mills, Andrew G. Christy, Georges Favreau
  • Journal:
    Mineralogical Magazine / Volume 82 / Issue 1 / February 2018
    Published online by Cambridge University Press:
    28 February 2018, pp. 181-187

  • The crystal structure of ceruleite, CuAl4[AsO4]2(OH)8(H2O)4, has been solved to an R1 of 0.0307, using the world's largest crystals from the Cap Garonne mine, France. Ceruleite crystallizes in space group P21/n, with the unit cell a = 7.2000(14), b = 11.345(2), c = 9.856(2) Å, β = 105.57(3)°, V = 775.6(3) Å3 and Z = 1. Ceruleite has a unique structure that consists of Al(O,OH)6 octahedra that are sharing edges to form rhombus-shaped tetramers. AsO4 tetrahedra share two corners with one such rhombus and the other two corners with each of two other rhombi, linking them into a very open mesoporous framework. Cu(OH)2(H2O)2 squares lie in the channels and link Al4 rhombi along || b. H2O molecules are also located in the channels.