Lepersonnite-(Gd)

Ca(Gd,Dy)2(UO2)24(SiO4)4(CO3)8(OH)24·48H2OIMA symbolLps-Gd[1]Strunz classification5.EG.10 (10 ed)
8/B.38-10 (8 ed)Dana classification17.1.12.1Crystal systemOrthorhombicCrystal classPyramidal (mm2) and dipyramidal (mmm)Space groupPnnm or Pnn2IdentificationColorYellow (bright)Crystal habitNeedle-like crystals in crusts (mammilary) or spherulesSpecific gravityFassDensity3.97 (measured)Optical propertiesBiaxal (-)Refractive indexnα = 1.638, nβ = 1.666, nγ = 1.6822V angle73° (calculated)Other characteristics RadioactiveReferences[2][3][4]

Lepersonnite-(Gd) is a very rare-earth element and uranium mineral with the chemical formula Ca(Gd,Dy)2(UO2)24(SiO4)4(CO3)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[2][4][5] and is named after the Belgian geologist Jacques Lepersonne.

References

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b 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.
  3. ^ "Lepersonnite-(Gd) - Handbook of Mineralogy" (PDF). Handbookofmineralogy.org. Retrieved 2016-03-08.
  4. ^ a b "Lepersonnite-(Gd): Lepersonnite-(Gd) mineral information and data". Mindat.org. Retrieved 2016-03-04.
  5. ^ Gadolinium: The mineralogy of gadolinium - Mindat. org [1]


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