Wulfenite

Wulfenite

  • Named in honour of Franz Xavier Wulfen (1728–1805), Austrian–German Jesuit, who wrote a monograph on the lead ores of Bleiberg, Austria.
  • Wulfenite was voted “Mineral of the Year” in Austria in 2020.
  • In its pure form wulfenite is colorless; the often yellow to red colour is most probably due to trace amounts of chromium substituting Mo.
  • Formula: PbMoO4
  • Space group: I41/(No. 88)
  • Crystal system: tetragonal
  • Crystal class: 4/m
  • Lattice parameters: a = b = 5.434 Å, c = 12.107 Å, α = β = γ = 90°

Modified by CombineZP

Picture: Didier Descouens – CC BY-SA 4.0
https://commons.wikimedia.org/w/index.php?curid=12426342


Crystal structure (click on the picture 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).)

  • PbO8 coordination environment
  • MoO4 tetrahedra (blue)
  • Pb (black)
  • Oxygen (red)

For a 3D interactive version on sketchfab, see here:

https://skfb.ly/6PW6U

Reference:
Natural wulfenite: structural refinement by single-crystal X-ray diffraction
C. Lugli, L. Medici, D. Saccardo,
Neues Jahrbuch fur Mineralogie, Monatshefte 1999, 6, 281-288

2 thoughts on “Wulfenite

  1. Mineralexpert

    Yes, the color change is caused by the Cr substitution. Here is the paper with more details about color and also presence of OH groups in wulfenite: https://www.researchgate.net/profile/Dominik_Talla/publication/257391396_On_the_presence_of_hydrous_defects_in_differently_coloured_wulfenites_PbMoO4_An_infrared_and_optical_spectroscopic_study/links/54b12bc40cf28ebe92dff6aa/On-the-presence-of-hydrous-defects-in-differently-coloured-wulfenites-PbMoO4-An-infrared-and-optical-spectroscopic-study.pdf

    Reply

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