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Leószilárdite

A valid IMA mineral species
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About LeószilárditeHide

04847060014951042413266.jpg
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 IdentifiersHide

Mindat ID:
47785
Long-form identifier:
mindat:1:1:47785:5
GUID
(UUID V4):
8578cc1c-d95b-48e9-985f-57e9ccf64ff2

IMA Classification of LeószilárditeHide

Classification of LeószilárditeHide

5.ED.60

5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
D : UO2:CO3 = 1:3

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
LszIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of LeószilárditeHide

Transparency:
Translucent
Colour:
Pale yellow
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
along {001}
Fracture:
Irregular/Uneven

Optical Data of LeószilárditeHide

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.
Surface Relief:
Moderate
Dispersion:
r > v, slight
Pleochroism:
Visible
Comments:
X = colorless, Y and Z = light yellow; X < Y ≈ Z.

Chemistry of LeószilárditeHide

Mindat Formula:
Na6Mg(UO2)2(CO3)6 · 6H2O

Crystallography of LeószilárditeHide

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)°
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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of LeószilárditeHide

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:
Na2O14.54 %
MgO3.05 %
UO347.95 %
H2O9.51 %
CO222.13 %
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 LeószilárditeHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
4 photos of Leószilárdite associated with AndersoniteNa2Ca(UO2)(CO3)3 · 6H2O

Related Minerals - Strunz-mindat GroupingHide

5.ED.ParamarkeyiteCa2(UO2)(CO3)3 · 5H2OMon. 2/m
5.ED.Pendevilleite-(Y)Mg2Y3Al(UO2)2(CO3)7(OH)6(H2O)16Tric. 1 : P1
5.ED.05BayleyiteMg2(UO2)(CO3)3 · 18H2OMon. 2/m : P21/b
5.ED.10SwartziteMgCa(UO2)(CO3)3 · 12H2OMon. 2/m : P21/m
5.ED.15AlbrechtschraufiteCa4Mg(UO2)2(CO3)6F2 · 17-18H2OTric. 1 : P1
5.ED.20LiebigiteCa2(UO2)(CO3)3 · 11H2OOrth. mm2
5.ED.25RabbittiteCa3Mg3(UO2)2(CO3)6(OH)4 · 18H2OMon.
5.ED.30AndersoniteNa2Ca(UO2)(CO3)3 · 6H2OTrig. 3 : R3
5.ED.35GrimseliteK3Na(UO2)(CO3)3 · H2OHex. 6 m2 : P62c
5.ED.40WidenmannitePb2(OH)2[(UO2)(CO3)2]Orth.
5.ED.45Znucalite Zn10Ca0.83(UO2)0.83(CO3)4(OH)15.31(H2O)5.48Mon. 2/m : P21/m
5.ED.50ČejkaiteNa4(UO2)(CO3)3Mon. m : Bb
5.ED.50AgricolaiteK4(UO2)(CO3)3Mon. 2/m : B2/b
5.ED.55LínekiteK2Ca3[(UO2)(CO3)3]2 · 8H2OOrth. mmm (2/m 2/m 2/m) : Pnnm
5.ED.55BrauneriteK2Ca(UO2)(CO3)3 · 6H2OMon. 2/m : P21/b
5.ED.65PseudomarkeyiteCa8(UO2)4(CO3)12 · 21H2OMon. 2/m : P21/m
5.ED.65MarkeyiteCa9(UO2)4(CO3)13 · 28H2OOrth. mmm (2/m 2/m 2/m) : Pmmn
5.ED.65NatromarkeyiteNa2Ca8(UO2)4(CO3)13 · 27H2OOrth. mmm (2/m 2/m 2/m) : Pmmn
5.ED.70PaddlewheeliteMgCa5Cu2(UO2)4(CO3)12(H2O)33Mon. m : Pb

Fluorescence of LeószilárditeHide

Fluoresces green under both LW and SW UV

Other InformationHide

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 LeószilárditeHide

References for LeószilárditeHide

Localities for LeószilárditeHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
USA
 
  • Utah
    • San Juan County
      • La Sal Mining District
Joe Marty Collection
      • Red Canyon Mining District
Mineralogical Magazine: 80: 691–697 +3 other references
 
Mineral and/or Locality  
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