Lepersonnite-(Gd)
A valid IMA mineral species
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About Lepersonnite-(Gd)
Jacques, Lambert, Désiré Lepersonne
Formula:
Ca(Gd,Dy)2(UO2)24(SiO4)4(CO3)8(OH)24 · 48H2O
Colour:
Bright yellow
Specific Gravity:
3.97
Crystal System:
Orthorhombic
Name:
After Jacques Lepersonne (Mulhouse, France October 26, 1909 - Etterbeek, Brussels, August 10, 1997); Royal Belgian Museum for Central Africa. He was honorary head of the Department of Geology and Mineralogy at the museum where the type specimens are preserved. The suffix was added in 1987.
Used to be a unique species in terms of gadolinium dominance. Currently third such (named; unnamed species are not considered here) species after approval of monazite-(Gd) and xenotime-(Gd).
The Gd analogue of lepersonnite-(Nd).
Not approved phases with species-defining gadolinium were identified in the The Moon regolith; there are also single finds from Kudriavy volcano, Russia (an oxide phase) and Kyauk Tha Mtn, Myanmar (Unnamed (Gd-dominant monazite)).
For more information about separation of Gd, Dy, and Sm from more abundant REEs see Unnamed (Possible Samarium Chloride) and Pavlovskoe REE-coal deposit site.
The Gd analogue of lepersonnite-(Nd).
Not approved phases with species-defining gadolinium were identified in the The Moon regolith; there are also single finds from Kudriavy volcano, Russia (an oxide phase) and Kyauk Tha Mtn, Myanmar (Unnamed (Gd-dominant monazite)).
For more information about separation of Gd, Dy, and Sm from more abundant REEs see Unnamed (Possible Samarium Chloride) and Pavlovskoe REE-coal deposit site.
Unique Identifiers
Mindat ID:
2378
Long-form identifier:
mindat:1:1:2378:4
GUID
(UUID V4):
(UUID V4):
9b9495a2-9ba1-456c-9786-27388c9e020a
IMA Classification of Lepersonnite-(Gd)
Approved
IMA status notes:
Renamed by the IMA
IMA Formula:
CaGd2(UO2)24(CO3)8Si4O28 · 60H2O
First published:
1982
Classification of Lepersonnite-(Gd)
5.EG.10
5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
G : With SO4 or SiO4
5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
G : With SO4 or SiO4
17.1.12.1
17 : COMPOUND CARBONATES
1 : Miscellaneous
17 : COMPOUND CARBONATES
1 : Miscellaneous
17.4.12
17 : Silicates Containing other Anions
4 : Silicates with carbonates
17 : Silicates Containing other Anions
4 : Silicates with carbonates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Lps-Gd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Lepersonnite-(Gd)
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Lepersonnite-(Gd)
Transparency:
Transparent, Translucent
Colour:
Bright yellow
Density:
3.97(5) g/cm3 (Measured) 4.01 g/cm3 (Calculated)
Optical Data of Lepersonnite-(Gd)
Type:
Biaxial (-)
RI values:
nα = 1.638 nβ = 1.666 nγ = 1.682
2V:
Measured: 73° , Calculated: 72°
Max Birefringence:
δ = 0.044
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
Relatively weak.
Optical Extinction:
Y = c.
Pleochroism:
Visible
Comments:
X = pale yellow; Y = Z = bright yellow
Chemistry of Lepersonnite-(Gd)
Mindat Formula:
Ca(Gd,Dy)2(UO2)24(SiO4)4(CO3)8(OH)24 · 48H2O
Crystallography of Lepersonnite-(Gd)
Crystal System:
Orthorhombic
Cell Parameters:
a = 16.23(3) Å, b = 38.74(9) Å, c = 11.73(3) Å
Ratio:
a:b:c = 0.419 : 1 : 0.303
Unit Cell V:
7,375.24 ų (Calculated from Unit Cell)
Z:
2
Comment:
Point Group: 2/m 2/m 2/m or mm2 ;Space Group: Pnnm or P nn2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.15 Å | (100) |
| 3.65 Å | (70) |
| 3.21 Å | (50) |
| 2.86 Å | (40) |
| 4.06 Å | (15) |
| 11.1 Å | (10) |
| 6.46 Å | (10) |
Comments:
Shinkolobwe, Congo. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47f : [Uranyl (U⁶⁺) minerals] |
Type Occurrence of Lepersonnite-(Gd)
General Appearance of Type Material:
As mammilary crusts or spherules, to 5 mm in diameter, composed of radiating acicular crystals elongated along [001].
Place of Conservation of Type Material:
Royal Museum for Central Africa, Tervuren, Belgium, number RGM 13.781 (holotype).
National Museum for Natural History, Washington, D.C., USA, number 150.228 (type).
National Museum for Natural History, Washington, D.C., USA, number 150.228 (type).
Associated Minerals at Type Locality:
Reference:
Deliens M, Piret P (1982) Bijvoetite et lepersonnite, carbonates hydratés d'uranyle et de terres rares de Shinkolobwe, Zaïre. The Canadian Mineralogist 20, 231-238
Synonyms of Lepersonnite-(Gd)
Other Language Names for Lepersonnite-(Gd)
German:Lepersonnit-(Gd)
Common Associates
Associated Minerals Based on Photo Data:
| 6 photos of Lepersonnite-(Gd) associated with Studtite | [(UO2)(O2)(H2O)2] · H2O |
| 6 photos of Lepersonnite-(Gd) associated with Becquerelite | Ca(UO2)6O4(OH)6 · 8H2O |
| 5 photos of Lepersonnite-(Gd) associated with Curite | Pb3(H2O)2[(UO2)4O4(OH)3]2 |
| 4 photos of Lepersonnite-(Gd) associated with Uraninite | UO2 |
| 3 photos of Lepersonnite-(Gd) associated with Fourmarierite | Pb(UO2)4O3(OH)4 · 4H2O |
| 3 photos of Lepersonnite-(Gd) associated with Bijvoetite-(Y) | Y8(UO2)16(CO3)16O8(OH)8 · 39H2O |
| 2 photos of Lepersonnite-(Gd) associated with Gummite | |
| 2 photos of Lepersonnite-(Gd) associated with Uranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
Related Minerals - Strunz-mindat Grouping
| 5.EG. | Lepersonnite-(Nd) | Nd4(UO2)24(SiO4)4(CO3)8(OH)28 · 48H2O |
| 5.EG.05 | Schröckingerite | NaCa3(UO2)(CO3)3(SO4)F · 10H2O |
| 5.EG.05 | UM1997-27-CO:CaHKSU | KCa3(UO2)(CO3)3(SO4)F · 10H2O |
| 5.EG.15 | Ježekite | Na8[(UO2)(CO3)3](SO4)2 · 3H2O |
Fluorescence of Lepersonnite-(Gd)
Not fluorescent.
Other Information
Notes:
Radioactive
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Lepersonnite-(Gd)
mindat.org URL:
https://www.mindat.org/min-2378.html
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References for Lepersonnite-(Gd)
Reference List:
Dunn, P. J., Fleischer, M., Chao, G. Y., Cabri, L. J., Mandarino, J. A. (1983) New mineral names. American Mineralogist, 68 (11-12) 1248-1252
Localities for Lepersonnite-(Gd)
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
DR Congo (TL) | |
| Deliens et al. (1982) +1 other reference |
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Shinkolobwe Mine, Shinkolobwe, Kambove Territory, Haut-Katanga, DR Congo