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Wyartite

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Formula:
CaU5+(UO2)2(CO3)O4(OH) · 7H2O
Colour:
Black, violet-black (fresh); yellowish brown, greenish brown (exposed)
Lustre:
Vitreous, Sub-Metallic, Dull
Hardness:
3 - 4
Specific Gravity:
4.69
Crystal System:
Orthorhombic
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 first recognized mineral with pentavalent uranium, beside containing typical hexavalent one in the form of uranyl groups. The other two minerals sharing this feature are richetite and shinkolobweite.

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


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Classification of WyartiteHide

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

Physical Properties of WyartiteHide

Vitreous, Sub-Metallic, Dull
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:
3 - 4 on Mohs scale
Cleavage:
Perfect
(001) perfect, also (010)
Density:
4.69(5) g/cm3 (Measured)    

Optical Data of WyartiteHide

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 WyartiteHide

Formula:
CaU5+(UO2)2(CO3)O4(OH) · 7H2O

Crystallography of WyartiteHide

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 V:
1,671.06 ų (Calculated from Unit Cell)
Z:
2

Type Occurrence of WyartiteHide

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?)

Synonyms of WyartiteHide

Other Language Names for WyartiteHide

German:Wyartit
Spanish:Wyartita

Related Minerals - Nickel-Strunz GroupingHide

5.EA.05UM1997-24-CO:CaCuHUCa2Cu(UO2)2(CO3)2O3 · 3H2O
5.EA.10UrancalcariteCa(UO2)3(CO3)(OH)6 · 3H2OOrth.
5.EA.20Oswaldpeetersite(UO2)2(CO3)(OH)2 · 4H2OMon. 2/m : P21/b
5.EA.25RoubaultiteCu2(UO2)3(CO3)2O2(OH)2•4H2OTric. 1 : P1
5.EA.30Kamotoite-(Y)Y2(UO2)4(CO3)3O4 · 14H2OMon. 2/m
5.EA.35SharpiteCa(UO2)6(CO3)5(OH)4 · 6H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.11.1StichtiteMg6Cr3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
11.11.2Rutherfordine(UO2)CO3Orth. mm2 : Imm2
11.11.3Joliotite(UO2)CO3 · nH2OOrth.
11.11.4GrimseliteK3Na(UO2)(CO3)3 · H2OHex.
11.11.5BayleyiteMg2(UO2)(CO3)3 · 18H2OMon.
11.11.6MetazelleriteCa(UO2)(CO3)2 · 3H2OOrth.
11.11.7ZelleriteCa(UO2)(CO3)2 · 5H2OOrth.
11.11.9UrancalcariteCa(UO2)3(CO3)(OH)6 · 3H2OOrth.
11.11.10SharpiteCa(UO2)6(CO3)5(OH)4 · 6H2OOrth.
11.11.11VogliteCa2Cu(UO2)(CO3)4 · 6H2OMon.
11.11.12AndersoniteNa2Ca(UO2)(CO3)3 · 6H2OTrig. 3 : R3
11.11.13SwartziteMgCa(UO2)(CO3)3 · 12H2OMon. 2/m : P21/m
11.11.14RabbittiteCa3Mg3(UO2)2(CO3)6(OH)4 · 18H2OMon.
11.11.15Kamotoite-(Y)Y2(UO2)4(CO3)3O4 · 14H2OMon. 2/m
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 · 1.5H2OHex.
11.11.18Bijvoetite-(Y)Y8(UO2)16(CO3)16O8(OH)8 · 39H2OMon.
11.11.19WidenmannitePb2(OH)2[(UO2)(CO3)2]Orth.
11.11.20ZnucaliteZn12Ca(UO2)(CO3)3(OH)22 · 4H2OOrth.

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 WyartiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 WyartiteHide

Localities for WyartiteHide

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.
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
 
  • Auvergne-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.
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