A rare grass-green mineral: Bayldonite


  • named after its discoverer, the British physicist John Balydon
  • Formula: PbCu3(AsO4)2(OH)2
  • Space group: C2/c (No. 15)
  • Crystal system: monoclinic
  • Crystal class: 2/m
  • Lattice parameters: a = 10.15 Å, b = 5.89 Å, c = 14.08 Å, β  106.1°


Picture: Rob Lavinsky, iRocks.com – CC BY-SA 3.0

Crystal structure (click on the picture to download the VESTA file):


  • Cu: blue, As: green, Pb: black, O: red, H: white
  • elongated CuO6 octahedra
  • AsO4 tetrahedra
  • Pb surrounded by 7 oxygen atoms

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