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Leószilárdite

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Leo Szilard
Formula:
Na6Mg(UO2)2(CO3)6·6H2O
Colour:
Pale yellow
Hardness:
2
Crystal System:
Monoclinic
Name:
After the Hungarian-American physicist, inventor, and biologist Dr. Leó Szilárd (February 11, 1898 – May 30, 1964).
New structure type. Unique combination of elements.


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Classification of LeószilárditeHide

Approved
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.

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.

Chemical Properties of LeószilárditeHide

Formula:
Na6Mg(UO2)2(CO3)6·6H2O
IMA 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(36)
5.46(100)
4.64(28)
3.82(30)
3.383(33)
3.105(25)
2.864(31)
2.028(28)

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

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.

References for LeószilárditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Olds, T.A., Sadergaski, L., Plášil, J., Kampf, A.R., Burns, P.C., Steele, I.M., Marty, J. (2016): Leoszilardite, IMA 2015-128. CNMNC Newsletter No. 31, June 2016, page 694; Mineralogical Magazine: 80: 691–697
Olds, T.A., Sardegaski, L.R., Plášil, J., Kampf, A.R., Burns, P.C., Steele, I.M., Marty, J., Carlson, S.M., and Mills, O.P. (2017) Leószilárdite, the first Na,Mg-containing uranyl carbonate from the Markey Mine, San Juan County, Utah, USA. Mineralogical Magazine: 81: 743-754.

Internet Links 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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • Utah
    • San Juan Co.
      • White Canyon District
        • Red Canyon
Olds, T.A., Sadergaski, L., Plášil, J., Kampf, A.R., Burns, P.C., Steele, I.M., Marty, J. (2016): Leoszilardite, IMA 2015-128. CNMNC Newsletter No. 31, June 2016, page 694; Mineralogical Magazine: 80: 691–697; Olds, T.A., Sardegaski, L.R., Plášil, J., Kampf, A.R., Burns, P.C., Steele, I.M., Marty, J., Carlson, S.M., and Mills, O.P. (2017) Leószilárdite, the first Na,Mg-containing uranyl carbonate from the Markey Mine, San Juan County, Utah, USA. Mineralogical Magazine: 81: 743-754.
Mineral and/or Locality  
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