Lepersonnite-(Gd)

Lepersonnite-(Gd)
General
Category Carbonate mineral
Formula
(repeating unit)
Ca(Gd,Dy)2(UO2)24(SiO4)4(CO3)8(OH)24•48H2O
Strunz classification 8/B.38-10
Dana classification 17.1.12.1
Crystal system Orthorhombic, Pnnm or Pnn2
Identification
Color Yellow (bright)
Crystal habit needle-like crystals in crusts (mammilary) or spherules
Crystal symmetry Orthorhombic - mm2
Density 3.97 (measured)
Optical properties Biaxal (-)
Refractive index nα=1.638, nβ=1.666, nγ=1.682
2V angle 73o (calculated)
Other characteristics Radioactive
References [1][2][3]

Lepersonnite-(Gd) is a very rare rare earth and uranium mineral with the formula Ca(Gd,Dy)2(UO2)24(SiO4)4(CO3)8(OH)24•48H2O. It associates with bijvoetite-(Y) in Shinkolobwe deposit in Republic of Congo, famous for rare uranium minerals. Lepersonnite-(Gd) is unique in being the only confirmed mineral with essential gadolinium.[1][3][4]

References

  1. 1 2 Deliens, M., and Piret, P., 1982. Bijvoetite et lepersonnite, carbonates hydrates d'uranyle et des terres rares de Shinkolobwe, Zaïre. Canadian Mineralogist 20, 231-238
  2. "Lepersonnite-(Gd) - Handbook of Mineralogy" (PDF). Handbookofmineralogy.org. Retrieved 2016-03-08.
  3. 1 2 "Lepersonnite-(Gd): Lepersonnite-(Gd) mineral information and data". Mindat.org. Retrieved 2016-03-04.
  4. Gadolinium: The mineralogy of gadolinium - Mindat. org


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