Guilleminite

Guilleminite (Ba(UO2)3(SeO3)2(OH)4•3H2O) is a uranium mineral named by R. Pierrot, J. Toussaint, and T. Verbeek in 1965 in honor of Jean Claude Guillemin (1923–1994), a chemist and mineralogist. It is a rare uranium/selenium mineral found at the Musonoi Mine in the Katanga Province of the Democratic Republic of the Congo.[2]

Guilleminite
A cuprosklodowskite vug filled with well formed dark green vandenbrandeite crystals. These are dusted over with small yellow crystals of guilleminite.
General
CategoryOxide minerals
Formula
(repeating unit)		Ba(UO2)3(SeO3)2(OH)4•3H2O
Strunz classification4.JJ.10
Crystal systemOrthorhombic
Crystal classPyramidal (mm2)
(same H-M symbol)
Space groupP21nm
Identification
Other characteristics Radioactive
References[1][2][3]

This secondary mineral also includes barium in its structure, in addition to selenium and uranium. It is bright yellow in colour and usually has an acicular crystal habit. It has a Mohs hardness of 2–3.[4]

References
  1. Mineralienatlas
  2. Guilleminite: Guilleminite mineral information and data on Mindat.org
  3. Webmineral data
  4. Pierrot R, Toussaint J, Verbeek T. Bull. Soc. Franc. Mineral. Crist. 1965; 88: 132.
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