Lepersonnite-(Gd)
Lepersonnite-(Gd) is a very rare rare-earth and uranium mineral with the chemical formula Ca(Gd,Dy)2(UO2)24(SiO4)4(CO3)8(OH)24·48H2O. It occurs associated with bijvoetite-(Y) in the Shinkolobwe deposit in the Democratic Republic of the Congo, famous for rare uranium minerals. Lepersonnite-(Gd) is unique in being the only confirmed mineral with essential gadolinium.[2][4][5] It is named in honour of the Belgian geologist Jacques Lepersonne.
Lepersonnite-(Gd) | |
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![]() Lepersonnite-(Gd) (flat crystals) intergrown in the yellow studtite clusters (needles) and orange curite. | |
General | |
Category | Carbonate mineral |
Formula (repeating unit) | Ca(Gd,Dy)2(UO2)24(SiO4)4(CO3)8(OH)24·48H2O |
IMA symbol | Lps-Gd[1] |
Strunz classification | 5.EG.10 (10 ed) 8/B.38-10 (8 ed) |
Dana classification | 17.1.12.1 |
Crystal system | Orthorhombic |
Crystal class | Pyramidal (mm2) and dipyramidal (mmm) |
Space group | Pnnm or Pnn2 |
Identification | |
Color | Yellow (bright) |
Crystal habit | needle-like crystals in crusts (mammilary) or spherules |
Density | 3.97 (measured) |
Optical properties | Biaxal (-) |
Refractive index | nα = 1.638, nβ = 1.666, nγ = 1.682 |
2V angle | 73° (calculated) |
Other characteristics | ![]() |
References | [2][3][4] |
References
- 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.
- 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.
- "Lepersonnite-(Gd) - Handbook of Mineralogy" (PDF). Handbookofmineralogy.org. Retrieved 2016-03-08.
- "Lepersonnite-(Gd): Lepersonnite-(Gd) mineral information and data". Mindat.org. Retrieved 2016-03-04.
- Gadolinium: The mineralogy of gadolinium - Mindat. org
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