• Named in honor of Pierre Despujols (1888–1981), the founder of the Moroccan Geologic Survey (“Service de la carte géologique du Maroc”)
  • The mineral was first observed in 1962 in manganese ore samples from Tachgagalt (Anti-Atlas, Morocco).
  • Formula: Ca3Mn(SO4)2(OH)6  · 3 H2O
  • Space group: P-62c
  • Crystal system: hexagonal
  • Crystal class: -6m2
  • Lattice parameters: a = b =  8.5405(5) Å, c = 10.8094(9) Å, α = β = 90°, γ  120°

Picture: Rob Lavinsky, – CC BY-SA 3.0

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

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • CaO8 polyhedra (blue)
  • Mn(OH)6 octahedra (purple)
  • SO4 tetrahedra (yellow)
  • Oxygen (red)
  • Hydrogen (white)

For a 3D interactive version, see here:


[1] M.C. Barkley, H. Yang, S.H. Evans, R.T. Downs, M.J. Origlieri, Acta Cryst E 2011, 67, i47-i48.
DOI: 10.1107/S1600536811030911


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