Chemistry:Lepersonnite-(Gd)

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Lepersonnite-(Gd)
Lepersonnite-(Gd)-Studtite-Curite-201138.jpg
Lepersonnite-(Gd) (flat crystals) intergrown in the yellow studtite clusters (needles) and orange curite.
General
CategoryCarbonate mineral
Formula
(repeating unit)
Ca(Gd,Dy)
2
(UO
2
)
24
(SiO
4
)
4
(CO
3
)
8
(OH)
24
 · 48H2O
Strunz classification5.EG.10 (10 ed)
8/B.38-10 (8 ed)
Dana classification17.1.12.1
Crystal systemOrthorhombic
Crystal classPyramidal (mm2) and dipyramidal (mmm)
Space groupPnnm or Pnn2
Identification
ColorYellow (bright)
Crystal habitNeedle-like crystals in crusts (mammilary) or spherules
Specific gravityFass
Density3.97 (measured)
Optical propertiesBiaxal (-)
Refractive indexnα = 1.638, nβ = 1.666, nγ = 1.682
2V angle73° (calculated)
Other characteristicsRadioactive.svg Radioactive
References[1][2][3]

Lepersonnite-(Gd) is a very rare-earth element and uranium mineral with the chemical formula Ca(Gd,Dy)
2
(UO
2
)
24
(SiO
4
)
4
(CO
3
)
8
(OH)
24
 · 48H2O
. It occurs with bijvoetite-(Y) in the Shinkolobwe deposit in the Democratic Republic of the Congo, famous for rare uranium minerals. It is the only confirmed mineral with essential gadolinium[1][3][5] and is named after the Belgian geologist Jacques Lepersonne.

References

  1. Jump up to: 1.0 1.1 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". http://www.handbookofmineralogy.org/pdfs/lepersonnite-(Gd).pdf. Retrieved 2016-03-08. 
  3. Jump up to: 3.0 3.1 "Lepersonnite-(Gd): Lepersonnite-(Gd) mineral information and data". http://www.mindat.org/min-2378.html. Retrieved 2016-03-04. 
  4. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode2021MinM...85..291W. 
  5. Gadolinium: The mineralogy of gadolinium - Mindat. org [1]