Chemistry:Lepersonnite-(Gd)
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| Lepersonnite-(Gd) | |
|---|---|
-Studtite-Curite-201138.jpg) 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(UO 2) 24(SiO 4) 4(CO 3) 8(OH) 24 · 48H2O |
| 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 |
| Specific gravity | Fass |
| Density | 3.97 (measured) |
| Optical properties | Biaxal (-) |
| Refractive index | nα = 1.638, nβ = 1.666, nγ = 1.682 |
| 2V angle | 73° (calculated) |
| Other characteristics |  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
- ↑ 1.0 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.
- ↑ "Lepersonnite-(Gd) - Handbook of Mineralogy". http://www.handbookofmineralogy.org/pdfs/lepersonnite-(Gd).pdf. Retrieved 2016-03-08.
- ↑ 3.0 3.1 "Lepersonnite-(Gd): Lepersonnite-(Gd) mineral information and data". http://www.mindat.org/min-2378.html. Retrieved 2016-03-04.
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
- ↑ Gadolinium: The mineralogy of gadolinium - Mindat. org [1]
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