Leószilárdite
A valid IMA mineral species
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About Leószilárdite
Leo Szilard
Formula:
Na6Mg(UO2)2(CO3)6 · 6H2O
Colour:
Pale yellow
Hardness:
2
Crystal System:
Monoclinic
Name:
Named in honor of Leó Szilárd (11 February 1898, Budapest, Hungary – 30 May 1964, La Jolla, California, USA), physicist, inventor, and biologist. He conceived the idea of an electron microscope and the nuclear chain reaction. He patented ideas for a nuclear reactor, a linear accelerator, and a cyclotron.
New structure type. Unique combination of elements.
Unique Identifiers
Mindat ID:
47785
Long-form identifier:
mindat:1:1:47785:5
GUID
(UUID V4):
(UUID V4):
8578cc1c-d95b-48e9-985f-57e9ccf64ff2
IMA Classification of Leószilárdite
Approved
IMA status notes:
Renamed by the IMA
Approval history:
Approved by IMA in 2015 with the name leoszilardite (IMA 2015-128). Renamed as leószilárdite by IMA in 2016.
Type description reference:
Olds, Travis A., Sadergaski, Luke R., Plášil, Jakub, Kampf, Anthony R., Burns, Peter C., Steele, Ian M., Marty, Joe, Carlson, Shawn M., Mills, Owen P. (2017) Leószilárdite, the first Na,Mg-containing uranyl carbonate from the Markey Mine, San Juan County, Utah, USA. Mineralogical Magazine, 81 (5) 1039-1050 doi:10.1180/minmag.2016.080.149
Classification of Leószilárdite
5.ED.60
5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
D : UO2:CO3 = 1:3
5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
D : UO2:CO3 = 1:3
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 |
|---|---|---|
| Lsz | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Leószilárdite
Transparency:
Translucent
Colour:
Pale yellow
Streak:
White
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
along {001}
along {001}
Fracture:
Irregular/Uneven
Optical Data of Leószilárdite
Type:
Biaxial (-)
RI values:
nα = 1.504(1) nβ = 1.597(1) nγ = 1.628(1)
2V:
Measured: 57° , Calculated: 57.1°
Max Birefringence:
δ = 0.124
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:
r > v, slight
Pleochroism:
Visible
Comments:
X = colorless, Y and Z = light yellow; X < Y ≈ Z.
Chemistry of Leószilárdite
Mindat Formula:
Na6Mg(UO2)2(CO3)6 · 6H2O
Crystallography of Leószilárdite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 11.609(2) Å, b = 6.784(1) Å, c = 15.106(3) Å
β = 91.378(3)°
β = 91.378(3)°
Ratio:
a:b:c = 1.711 : 1 : 2.227
Unit Cell V:
1189.4 ų
Z:
2
Morphology:
Aggregates of bladed crystals flattened on {001} and elongated along [010]; Forms observed: {110}, {001}, {100}, {101}, and {-101}. As pearlescent masses to 2 mm consisting of very small plates.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.59 Å | (36) |
| 5.46 Å | (100) |
| 4.64 Å | (28) |
| 3.82 Å | (30) |
| 3.383 Å | (33) |
| 3.105 Å | (25) |
| 2.864 Å | (31) |
| 2.028 Å | (28) |
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 Leószilárdite
Place of Conservation of Type Material:
Mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA (catalogue number 65645)
Chemical Analysis of Type Material:
| Na2O | 14.54 % |
|---|---|
| MgO | 3.05 % |
| UO3 | 47.95 % |
| H2O | 9.51 % |
| CO2 | 22.13 % |
| Total: | 97.18 % |
Associated Minerals at Type Locality:
Reference:
Olds, T.A., Sadergaski, L.R., Plášil, J., Kampf, A.R., Burns, P.C., Steele, I.M., Marty, J., Carlson, S., Mills, O.P. (2017): Leószilárdite, the first Na,Mg-containing uranyl carbonate from the Markey Mine, San Juan County, Utah, USA. Mineralogical Magazine: 81:1039-1050.
Synonyms of Leószilárdite
Common Associates
Associated Minerals Based on Photo Data:
| 4 photos of Leószilárdite associated with Andersonite | Na2Ca(UO2)(CO3)3 · 6H2O |
Related Minerals - Strunz-mindat Grouping
| 5.ED. | Paramarkeyite | Ca2(UO2)(CO3)3 · 5H2O |
| 5.ED. | Pendevilleite-(Y) | Mg2Y3Al(UO2)2(CO3)7(OH)6(H2O)16 |
| 5.ED.05 | Bayleyite | Mg2(UO2)(CO3)3 · 18H2O |
| 5.ED.10 | Swartzite | MgCa(UO2)(CO3)3 · 12H2O |
| 5.ED.15 | Albrechtschraufite | Ca4Mg(UO2)2(CO3)6F2 · 17-18H2O |
| 5.ED.20 | Liebigite | Ca2(UO2)(CO3)3 · 11H2O |
| 5.ED.25 | Rabbittite | Ca3Mg3(UO2)2(CO3)6(OH)4 · 18H2O |
| 5.ED.30 | Andersonite | Na2Ca(UO2)(CO3)3 · 6H2O |
| 5.ED.35 | Grimselite | K3Na(UO2)(CO3)3 · H2O |
| 5.ED.40 | Widenmannite | Pb2(OH)2[(UO2)(CO3)2] |
| 5.ED.45 | Znucalite | Zn10Ca0.83(UO2)0.83(CO3)4(OH)15.31(H2O)5.48 |
| 5.ED.50 | Čejkaite | Na4(UO2)(CO3)3 |
| 5.ED.50 | Agricolaite | K4(UO2)(CO3)3 |
| 5.ED.55 | Línekite | K2Ca3[(UO2)(CO3)3]2 · 8H2O |
| 5.ED.55 | Braunerite | K2Ca(UO2)(CO3)3 · 6H2O |
| 5.ED.65 | Pseudomarkeyite | Ca8(UO2)4(CO3)12 · 21H2O |
| 5.ED.65 | Markeyite | Ca9(UO2)4(CO3)13 · 28H2O |
| 5.ED.65 | Natromarkeyite | Na2Ca8(UO2)4(CO3)13 · 27H2O |
| 5.ED.70 | Paddlewheelite | MgCa5Cu2(UO2)4(CO3)12(H2O)33 |
Fluorescence of Leószilárdite
Fluoresces green under both LW and SW UV
Other Information
Notes:
Readily soluble in room temperature H2O.
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 Leószilárdite
mindat.org URL:
https://www.mindat.org/min-47785.html
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References for Leószilárdite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter no 31. Mineralogical Magazine, 80 (4) 691-697 doi:10.1180/minmag.2016.080.083
Olds, Travis A., Sadergaski, Luke R., Plášil, Jakub, Kampf, Anthony R., Burns, Peter C., Steele, Ian M., Marty, Joe, Carlson, Shawn M., Mills, Owen P. (2017) Leószilárdite, the first Na,Mg-containing uranyl carbonate from the Markey Mine, San Juan County, Utah, USA. Mineralogical Magazine, 81 (5) 1039-1050 doi:10.1180/minmag.2016.080.149
Localities for Leószilárdite
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.
USA | |
| Joe Marty Collection |
| Mineralogical Magazine: 80: 691–697 +3 other references |
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Markey Mine, Red Canyon Mining District, San Juan County, Utah, USA