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Weeksite

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Formula:
K2(UO2)2(Si5O13) · 4H2O
System:
Orthorhombic
Colour:
Yellow
Hardness:
1 - 2
Name:
Named in 1960 by W. F. Osterbridge, Mortimer Hay Staatz, Robert Meyrowitz, and A. M. Plummer in honor of Alice Mary Dowse Weeks [August, 26, 1909 Sherborn, Massachusetts, USA - August 29, 1988 Bryn Mawr, Pennsylvania, USA], mineralogist for the United States Geological Survey and later professor of mineralogy, Temple University (Philadelphia, USA).
This page provides mineralogical data about Weeksite.

Classification of Weeksite

Approved
9.AK.30

9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
53.3.2.1

53 : NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
3 : Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
14.16.5

14 : Silicates not Containing Aluminum
16 : Silicates of U
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First Recorded Occurrence of Weeksite

Year of Discovery:
1960

Physical Properties of Weeksite

Waxy, Silky
Colour:
Yellow
Hardness (Mohs):
1 - 2

Crystallography of Weeksite

Crystal System:
Orthorhombic
Cell Parameters:
a = 14.26Å, b = 35.88Å, c = 14.2Å
Ratio:
a:b:c = 0.397 : 1 : 0.396
Unit Cell Volume:
V 7,265.41 ų (Calculated from Unit Cell)

Optical Data of Weeksite

Type:
Biaxial (-)
RI values:
nα = 1.596 nβ = 1.603 nγ = 1.606
2V:
Measured: 60° , Calculated: 66°
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v weak

Chemical Properties of Weeksite

Formula:
K2(UO2)2(Si5O13) · 4H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Al,Fe,Ca,Ba,Na,C

Relationship of Weeksite to other Species

9.AK.05Soddyite(UO2)2SiO4 · 2H2O
9.AK.10CuprosklodowskiteCu(UO2)2[HSiO4]2 · 6H2O
9.AK.10Oursinite(Co,Mg)(UO2)2[HSiO4]2 · 6H2O
9.AK.10SklodowskiteMg(UO2)2[HSiO4]2 · 5H2O
9.AK.15Boltwoodite(K,Na)(UO2)[HSiO4] · 0.5H2O
9.AK.15KasolitePb(UO2)[SiO4] · H2O
9.AK.15Natroboltwoodite(H3O)(Na,K)UO2SiO4 · H2O
9.AK.15Uranophane-βCa(UO2)2(HSiO4)2 · 5H2O
9.AK.15UranophaneCa(UO2)2[HSiO4]2 · 5H2O
9.AK.15Beta-Uranophane
9.AK.20SwamboiteUH6(UO2)6(SiO4)6 · 30H2O
9.AK.25HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2O
9.AK.25MetahaiweeiteCa(UO2)2Si6O15 · nH2O
9.AK.25Ranquilite
9.AK.30CoutinhoiteThxBa(1-2x)(UO2)2Si5O13 · (H2O)1+y (0 < x < 0.5 and 0 < y < (2+x))
9.AK.35Ursilite(Mg,Ca)4(UO2)4(Si2O5)5.5(OH)5 · 13H2O
9.AK.35MagnioursiliteMg4(UO2)4(Si2O5)5(OH)6 · 20H2O
9.AK.35CalcioursiliteCa4(UO2)4(Si2O5)5(OH)6 · 15H2O
9.AK.40UranosiliteUO3 · 7SiO2
14.16.1UranosiliteUO3 · 7SiO2
14.16.2Coffinite(U4+,Th)(SiO4)1-x(OH)4x
14.16.3Soddyite(UO2)2SiO4 · 2H2O
14.16.4SwamboiteUH6(UO2)6(SiO4)6 · 30H2O
14.16.6Boltwoodite(K,Na)(UO2)[HSiO4] · 0.5H2O
14.16.7Natroboltwoodite(H3O)(Na,K)UO2SiO4 · H2O
14.16.8CuprosklodowskiteCu(UO2)2[HSiO4]2 · 6H2O
14.16.9SklodowskiteMg(UO2)2[HSiO4]2 · 5H2O
14.16.10UranophaneCa(UO2)2[HSiO4]2 · 5H2O
14.16.11Uranophane-βCa(UO2)2(HSiO4)2 · 5H2O
14.16.12HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2O
14.16.13MetahaiweeiteCa(UO2)2Si6O15 · nH2O
14.16.15Steacyite(◻,K)(Na,Ca)2(Th,U)[Si8O20]
14.16.16Ekanite(Ca,Fe2+,Pb)2(Th,U)[Si8O20]
14.16.17KasolitePb(UO2)[SiO4] · H2O
14.16.18OrlitePb3(UO2)3(Si2O7)2 · 6H2O
14.16.19Oursinite(Co,Mg)(UO2)2[HSiO4]2 · 6H2O

Other Names for Weeksite

Name in Other Languages:
German:Weeksit
Russian:Уиксит
Spanish:Weeksita

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 Weeksite

Reference List:
Outerbridge W.F., Staatz, M. H., Meyrowitz, R. & Pommer, A. M. (1960), Weeksite, a new uranium silicate from the Thomas Range, Juab Co., UT, American Mineralogist: 45: 39-52.

Doklady Akademii Nauk SSSR: 282(5): 1132-1136.

Jackson, J.M. and Burns, P.C. (2001) A re-evaluation of the structure of weeksite, a uranyl silicate framework mineral. Canadian Mineralogist: 39: 187-195.

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

K. Fejfarová, J. Plášil, H. Yang, J. Čejka, M. Dušek, R.T. Downs, M.C. Barkley, R. Škoda (2012): Revision of the crystal structure and chemical formula of weeksite, K2(UO2)2(Si5O13).4H2O. Am. Mineral. 97, 750-754.

Internet Links for Weeksite

Localities for Weeksite

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
 
  • South Australia
    • Flinders Ranges
      • North Flinders Ranges
        • Arkaroola Region (Arkaroola Station)
          • Mt Painter area
2003, Brugger, J., Ansermet, S. & Pring, A. ' Uranium minerals from Mt Painter, Northern Flinders ranges, South Australia' Australian Journal of Mineralogy, vol. 9, n°1, pp 15-31
Austria
 
  • Carinthia
    • Millstatt lake ridge
      • Fresach
        • Laas
G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
Brazil
 
  • Minas Gerais
    • Doce valley
      • Galiléia
Bruno Gioia specimen; Atencio D, Carvalho F M S, Matioli P A (2004) Coutinhoite, a new thorium uranyl silicate hydrate, from Urucum Mine, Galiléia, Minas Gerais, Brazil. American Mineralogist 89, 721-724
  • São Paulo
    • São Paulo
Revista Brasileira de Geociências 24(1):43-51, March 1994
Fosfatos e Silicatos Secundários de Urânio de Perus, São Paulo - Atencio, Daniel and Hypolito, Raphael - Revista Brasileira de Geociências, março de 1994
Chile
 
  • Atacama Region
    • Copiapó Province
      • Zapallar district
        • Los Azules area
According to Dr. Tony Kampf, mineral has been confirmed by EDS and PXRD analysis
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
      • Krušné Hory Mts (Erzgebirge)
        • Jáchymov District (St Joachimsthal)
Lapis 2002(7/8), 63-65
      • Mariánské Lázně (Marienbad)
Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
    • Plzeň Region
      • Nepomuk (Pomuk)
Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Menzenschwand
Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
  • Bavaria
    • Franconia
      • Spessart
        • Aschaffenburg
          • Dörrmorsbach
A. Wittern: "Mineralfundorte in Deutschland", Schweizerbart (Stuttgart), 2001
Japan
 
  • Honshu Island
    • Chugoku Region
      • Tottori Prefecture
K. Watanabe (1976) Journal of the Faculty of Science, Shinshu University, 11, 53-113 (in japanese with english summary)
Mexico
 
  • Chihuahua
    • Mun. de Aldama
      • Peña Blanca District
        • Sierra Peña Blanca
Panczner(1987): 265 & 392.
Panczner(1987):265 & 392.
Panczner(1987):392.; Econ Geol (1991) 86:233-248
Panczner(1987):392.
Panczner(1987):392.
Namibia
 
  • Erongo Region
    • Swakopmund District
      • Goanikontes
Bezing, L. von, Bode, R. & Jahn, S. (2007): Namibia. Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag, Haltern, 338 pp. (in English)
USA
 
  • Arizona
    • Yavapai Co.
      • Date Creek Basin
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 155, 418.
      • Weaver Mts
        • Weaver District (Virginia District; Mocking Bird District)
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 418.
    • Yuma Co.
      • Muggins Mts
        • Muggins District
          • Muggins Mountains uranium prospects
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 127, 155, 411, 418; Outerbridge, W.F., et al (1960), Weeksite, a new uranium silicate from the Thomas Range, Juab Co., UT, Am.Min.: 45: 39-52; Honea, R.M. (1959), New data on gastunite, an alkalin uranyl silicate, Am.Min.: 44: 1047-1056.
  • California
    • Inyo Co.
      • Coso Mts (Coso Range)
        • Coso District (New Coso District)
Outerbridge, W.F., et al (1960), Weeksite, a new uranium silicate from the Thomas Range, Juab County, Utah, American Mineralogist (1960): 45: 39-52; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 517.
    • Lassen Co.
      • Mountain Meadow District
        • Round Mountain
American Mineralogist (1970): 45: 39-52.
  • Nevada
    • Humboldt Co.
      • Bottle Creek District
Nevada Bureau of Mines and Geology Online Documents OF06-19 - Nevada Uranium and Thorium Occurrences
NBMG files No. 50600003; Nevada Bureau of Mines and Geology NBMG Open-File Report 96-3 By Stephen B. Castor, Christopher D. Henry, Lisa A. Shevenell
NBMG Spec Pub 31 Minerals of Nevada
    • Mineral Co.
      • Marietta District
NBMG Spec Pub 31 Minerals of Nevada
    • Washoe Co.
      • Pyramid District
NBMG Spec Pub 31 Minerals of Nevada
  • New Mexico
    • Cibola Co.
Northrop, Minerals of New Mexico, 3rd. rev. ed. (1996)
Outerbridge, W.F., et al (1960), Weeksite, a new uranium silicate from the Thomas Range, Juab County, Utah, Am.Min.: 45: 39-52;
    • McKinley Co.
Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
  • Pennsylvania
    • Northampton Co.
      • Forks Township
        • Easton
          • Chestnut Hill
AmMin.45:39; Am Min. 66:610; Am.Min.: 45: 39-52
  • Texas
    • Live Oak Co.
R&M 66:3 pp 196-224
    • Presidio Co.
Am.Min.: 45: 39-52
  • Utah
    • Grand Co.
      • Yellow Cat District (W. part of Thompsons District)
Van King
    • Juab Co.
      • Thomas Range
UGMS Bull 117 Minerals and Mineral Localities of Utah
SLIDES OF THE FLUORSPAR, BERYLLIUM, AND URANIUM DEPOSITS AT SPOR MOUNTAIN, UTAH by David A. Lindsey
UGMS Bull 117 Minerals and Mineral Localities of Utah
Outerbridge, W.F., et al (1960), Weeksite, a new uranium silicate from the Thomas Range, Juab County, Utah, Am.Min.: 45: 39-52; Min.Rec.: 10: 271.
UGMS Bull 117 Minerals and Mineral Localities of Utah
    • San Juan Co.
      • White Canyon District
        • Red Canyon
Collection of Alex Earl
  • Wyoming
    • Niobrara Co.
Outerbridge, W.F., et al (1960), Weeksite, a new uranium silicate from the Thomas Range, Juab County, Utah, Am.Min.: 45: 39-52;
Mineral and/or Locality  
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