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Leydetite

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About LeydetiteHide

Jean-Claude Leydet
Formula:
Fe(UO2)(SO4)2•11H2O
Colour:
yellow to greenish
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
2.55 (Calculated)
Crystal System:
Monoclinic
Name:
Honours Jean Claude Leydet (born 1961), an amateur mineralogist from Brest (France), who discovered the new mineral.
New structure type. Chemically related to deliensite.
Chemically very similar to rietveldite (a lower hydrate).

Isostructural with magnesioleydetite.

The structure is based on protasite anion topology; there is a sheet of UO7 bipyramids, that share four of their equatorial vertices with sulfate tetrahedra; thus, each tetrahedron has two vertices shared with UO7. The unshared equatorial vertices contain water molecules. The sheets are perpendicular to c. Fe ions and water molecules in the interlayer space link to the sheets via hydrogen bonds.


Classification of LeydetiteHide

Approved

Physical Properties of LeydetiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
yellow to greenish
Streak:
yellowish white
Hardness:
Cleavage:
Perfect
perfect cleavage on (001).
Density:
2.55 g/cm3 (Calculated)

Optical Data of LeydetiteHide

Type:
Biaxial
RI values:
nα = 1.513(2) nβ = 1.522(2)
Max Birefringence:
δ = 1.513
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic
Comments:
further optical properties could not be measured

Chemical Properties of LeydetiteHide

Formula:
Fe(UO2)(SO4)2•11H2O
IMA Formula:
Fe(UO2)(SO4)2 · 11H2O
Common Impurities:
Mg

Crystallography of LeydetiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 11.3173 Å, b = 7.7258 Å, c = 21.8121 Å
β = 102.383°
Ratio:
a:b:c = 1.465 : 1 : 2.823
Unit Cell V:
1,862.78 ų (Calculated from Unit Cell)
Z:
4
Comment:
C2/c

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.625(100)
6.277(1)
5.321(66)
3.549(5)
2.663(4)
2.131(2)
Comments:
From Type Description.

Type Occurrence of LeydetiteHide

General Appearance of Type Material:
tabular crystals up to 2 mm
Place of Conservation of Type Material:
Musée Cantonal de Géologie, Lausanne, Switzerland, registration number MGL 92661
Geological Setting of Type Material:
Mas d’Alary uranium deposit, Lode`ve, He´rault, France (43º42’33’’N 03º20’12’’E)

Synonyms of LeydetiteHide

Fluorescence of LeydetiteHide

Other InformationHide

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 LeydetiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
J. Plášil, J. Hauser, V. Petříček, N. Meisser, S. J. Mills, R. Škoda, K. Fejfarová, J. Čejka, J. Sejkora, J. Hloušek, J.-M. Johannet, V. Machovič, and L. Lapčák (2012): Crystal structure and formula revision of deliensite, Fe[(UO2)2(SO4)2(OH)2](H2O)7. Mineralogical Magazine 76, 2837-2860. [as unnamed phase]
Plášil, J., Kasatkin, A.V., Škoda, R., Novák, M., Kallistová, A., Fejfarová, K. and Meisser, N. (2013) Leydetite, IMA 2012-065. CNMNC Newsletter No. 15, February 2013, page 7; Mineralogical Magazine, 77, 1-12.
Plášil, J., Kasatkin. A.V., Škoda, R., Novák, M., Kallistová, A., Dušek, M., Skála R., Fejfarová, K., Čejka, J., Meisser, N., Goethals, H., Machovič, V. et Lapčá, L., (2013) Leydetite, Fe(UO2)(SO4)2(H2O)11, a new uranyl sulfate mineral from Mas d’Alary, Lodève, France. Mineralogical Magazine, 77, 429-441.

Internet Links for LeydetiteHide

Localities for LeydetiteHide

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.
France (TL)
 
  • Occitanie
    • Hérault
      • Lodève
Plášil, J., Kasatkin, A.V., Škoda, R., Novák, M., Kallistová, A., Fejfarová, K. and Meisser, N. (2013) Leydetite, IMA 2012-065. CNMNC Newsletter No. 15, February 2013, page 7; Mineralogical Magazine, 77, 1-12; Plášil, J., Kasatkin. A.V., Škoda, R., Novák, M., Kallistová, A., Dušek, M., Skála R., Fejfarová, K., Čejka, J., Meisser, N., Goethals, H., Machovič, V. et Lapčá, L., (2013) Leydetite, Fe(UO2)(SO4)2(H2O)11, a new uranyl sulfate mineral from Mas d’Alary, Lodève, France. Mineralogical Magazine, 77, 429-441.
  • Pays de la Loire
    • Loire-Atlantique
      • Gétigné
J. Plášil, J. Hauser, V. Petříček, N. Meisser, S. J. Mills, R. Škoda, K. Fejfarová, J. Čejka, J. Sejkora, J. Hloušek, J.-M. Johannet, V. Machovič, and L. Lapčák (2012): Crystal structure and formula revision of deliensite, Fe[(UO2)2(SO4)2(OH)2](H2O)7. Mineralogical Magazine 76, 2837-2860; Plášil, J., Kasatkin. A.V., Škoda, R., Novák, M., Kallistová, A., Dušek, M., Skála R., Fejfarová, K., Čejka, J., Meisser, N., Goethals, H., Machovič, V. et Lapčá, L., (2013) Leydetite, Fe(UO2)(SO4)2(H2O)11, a new uranyl sulfate mineral from Mas d’Alary, Lodève, France. Mineralogical Magazine, 77, 429-441.
Mineral and/or Locality  
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