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Wyartite

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Formula:
CaU5+(UO2)2(CO3)O4(OH) · 7H2O
System:
Orthorhombic
Colour:
Black, violet-black ...
Lustre:
Vitreous, Sub-Metallic, Dull
Hardness:
3 - 4
Name:
Named after Jean Wyart (1902-1992), Professor of Mineralogy, Sorbonne, Paris, France. [Obituary: http://journals.iucr.org/a/issues/1992/04/00/es0175/es0175.pdf]
Wyartite is unique in being the only mineral with pentavalent uranium, beside containing typical hexavalent one in the form of uranyl groups.

The structure contains sheets that are similar to those found in ianthinite, rameauite, and spriggite.


Classification of Wyartite

Approved
5.EA.15

5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
A : UO2:CO3 > 1:1
16b.7.4.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
11.11.8

11 : Carbonates
11 : Carbonates of Cr and U

Type Occurrence of Wyartite

General Appearance of Type Material:
In small crystals with (001) predominant, striated, and (110)
Geological Setting of Type Material:
as an alteration product of a red alteration product of uraninite (wolsendorfite?)

Physical Properties of Wyartite

Vitreous, Sub-Metallic, Dull
Diaphaneity (Transparency):
Transparent, Translucent, Opaque
Comment:
Luster dull, on cleavage vitreous to sub-metallic
Colour:
Black, violet-black (fresh); yellowish brown, greenish brown (exposed)
Streak:
brownish-violet
Hardness (Mohs):
3 - 4
Cleavage:
Perfect
(001) perfect, also (010)
Density:
4.69(5) g/cm3 (Measured)    

Crystallography of Wyartite

Crystal System:
Orthorhombic
Cell Parameters:
a = 11.25(3) Å, b = 7.08(2) Å, c = 20.98(5) Å
Ratio:
a:b:c = 1.589 : 1 : 2.963
Unit Cell Volume:
V 1,671.06 ų (Calculated from Unit Cell)
Z:
2

Optical Data of Wyartite

Type:
Biaxial (-)
RI values:
nα = 1.890(2) nβ = 1.890(2) nγ = 1.910(2)
2V:
Measured: 48°
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
strong
Pleochroism:
Strong
Comments:
X (=c) gray, Y (=b) violet, Z (=a) (lavender blue) .

Chemical Properties of Wyartite

Formula:
CaU5+(UO2)2(CO3)O4(OH) · 7H2O
All elements listed in formula:

Relationship of Wyartite to other Species

5.EA.05UM1997-24-CO:CaCuHUCa2Cu(UO2)2(CO3)2O3 · 3H2O
5.EA.10UrancalcariteCa(UO2)3(CO3)(OH)6 · 3H2O
5.EA.20Oswaldpeetersite(UO2)2(CO3)(OH)2 · 4H2O
5.EA.25RoubaultiteCu2(UO2)3(CO3)2O2(OH)2•4H2O
5.EA.30Kamotoite-(Y)Y2(UO2)4(CO3)3O4 · 14H2O
5.EA.35SharpiteCa(UO2)6(CO3)5(OH)4 · 6H2O
11.11.1StichtiteMg6Cr2(OH)16[CO3] · 4H2O
11.11.2Rutherfordine(UO2)CO3
11.11.3Joliotite(UO2)CO3 · nH2O
11.11.4GrimseliteK3Na(UO2)(CO3)3 · H2O
11.11.5BayleyiteMg2(UO2)(CO3)3 · 18H2O
11.11.6MetazelleriteCa(UO2)(CO3)2 · 3H2O
11.11.7ZelleriteCa(UO2)(CO3)2 · 5H2O
11.11.9UrancalcariteCa(UO2)3(CO3)(OH)6 · 3H2O
11.11.10SharpiteCa(UO2)6(CO3)5(OH)4 · 6H2O
11.11.11VogliteCa2Cu(UO2)(CO3)4 · 6H2O
11.11.12AndersoniteNa2Ca(UO2)(CO3)3 · 6H2O
11.11.13SwartziteMgCa(UO2)(CO3)3 · 12H2O
11.11.14RabbittiteCa3Mg3(UO2)2(CO3)6(OH)4 · 18H2O
11.11.15Kamotoite-(Y)Y2(UO2)4(CO3)3O4 · 14H2O
11.11.16Shabaite-(Nd)Ca(Nd,Sm,Y)2(UO2)(CO3)4(OH)2 · 6H2O
11.11.17Astrocyanite-(Ce)Cu2(Ce,Nd,La)2(UO2)(CO3)5(OH)2 · 1.5H2O
11.11.18Bijvoetite-(Y)Y8(UO2)16(CO3)16O8(OH)8 · 39H2O
11.11.19WidenmannitePb2(OH)2[(UO2)(CO3)2]
11.11.20ZnucaliteZn12Ca(UO2)(CO3)3(OH)22 · 4H2O

Other Names for Wyartite

Name in Other Languages:
German:Wyartit
Spanish:Wyartita

Other Information

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 Wyartite

Reference List:
Guillemin C, Protas J (1959) Ianthinite et wyartite. Bulletin de la Société française de Minéralogie et de Cristallographie (1959): 82: 80-86.

Fleischer M (1959) New mineral names. American Mineralogist (1959): 44: 908.

Burns, P.C. and Finch, R.J. (1999) Wyartite: crystallographic evidence for the first pentavalent-uranium mineral. American Mineralogist (1999): 84: 1456-1460.

Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Hawthorne F C, Finch R J, Ewing R C (2006) The crystal structure of dehydrated wyartite, Ca(CO3)[U5+(U6+O2)2O4(OH)](H2O)3. The Canadian Mineralogist 44, 1379-1385

Internet Links for Wyartite

mindat.org URL:
http://www.mindat.org/min-4319.html
Please feel free to link to this page.

Localities for Wyartite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • Northern Territory
    • West Arnhem Region
      • Kakadu
R.L. Frost, D.A. Henry, and K. Erickson, Raman spectroscopic detection of wyartite in the presence of rabejacite. Journal of Raman Spectroscopy, 2004. 35(4): p. 255- 260.
R.L. Frost, D.A. Henry, and K. Erickson, Raman spectroscopic detection of wyartite in the presence of rabejacite. Journal of Raman Spectroscopy, 2004. 35(4): p. 255- 260.
Democratic Republic of Congo (Zaïre) (TL)
 
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Shinkolobwe
[MinRec 20:288]; Burns, P.C. and Finch, R.J. (1999) Wyartite: crystallographic evidence for the first pentavalent-uranium mineral. American Mineralogist (1999): 84: 1456-1460.
France
 
  • Rhône-Alpes
    • Loire
      • Saint-Just-en-Chevalet
        • Saint-Priest-la-Prugne
Le Règne Minéral, Hors Série IV, 1998
J.-J. Périchaud: "Où trouver les minéraux d'Auvergne", Vol. 1, Editions l'Instant Durable (Clermont-Ferrand), 1985, p. 92
Jordan
 
  • Amman
Dill, H. G., Kus, J., Abed, A. M., Sachsenhofer, R. F., & Abul Khair, H. (2009). Diagenetic and epigenetic alteration of Cretaceous to Paleogene organic-rich sedimentary successions in northwestern Jordan, typical of the western margin of the Arabian Plate. GeoArabia, 14(2), 101-140.
Mineral and/or Locality  
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