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Weeksite

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Alice M. D. Weeks
Formula:
K2(UO2)2(Si5O13) · 4H2O
Colour:
Yellow
Lustre:
Waxy, Silky
Hardness:
1 - 2
Crystal System:
Orthorhombic
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.


Hide all sections | Show all sections

Classification of WeeksiteHide

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

Physical Properties of WeeksiteHide

Waxy, Silky
Colour:
Yellow
Hardness:
1 - 2 on Mohs scale

Optical Data of WeeksiteHide

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 WeeksiteHide

Formula:
K2(UO2)2(Si5O13) · 4H2O
Common Impurities:
Al,Fe,Ca,Ba,Na,C

Crystallography of WeeksiteHide

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

Type Occurrence of WeeksiteHide

Other Language Names for WeeksiteHide

German:Weeksit
Russian:Уиксит
Spanish:Weeksita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Carnotite10 photos of Weeksite associated with Carnotite on mindat.org.
Chalcedony4 photos of Weeksite associated with Chalcedony on mindat.org.
Fluorite3 photos of Weeksite associated with Fluorite on mindat.org.
Quartz3 photos of Weeksite associated with Quartz on mindat.org.
Opal3 photos of Weeksite associated with Opal on mindat.org.
Aragonite2 photos of Weeksite associated with Aragonite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AK.05Soddyite(UO2)2SiO4 · 2H2OOrth.
9.AK.10CuprosklodowskiteCu(UO2)2(SiO3OH]2 · 6H2OTric. 1 : P1
9.AK.10OursiniteCo(UO2)2(SiO3OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmca
9.AK.10SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2OMon. 2/m : B2/m
9.AK.15Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2OMon. 2 : P21
9.AK.15KasolitePb(UO2)[SiO4] · H2OMon. 2/m : P21/b
9.AK.15NatroboltwooditeNa(UO2)(SiO3OH) · H2O
9.AK.15Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2OMon.
9.AK.15UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
9.AK.15Beta-UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
9.AK.20Swamboite-(Nd)Nd0.333[(UO2)(SiO3OH)](H2O)∼2.5Mon.
9.AK.25HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OMon.
9.AK.25MetahaiweeiteCa(UO2)2Si6O15 · nH2O
9.AK.25RanquiliteCa(UO2)2[Si5O12(OH)2] · 6H2O
9.AK.30CoutinhoiteThxBa(1-2x)(UO2)2Si5O13 · (H2O)1+y (0 < x < 0.5 and 0 < y < (2+x))Orth.
9.AK.35UrsiliteMg4(UO2)4(Si2O5)5.5(OH)5 · 13H2OOrth.
9.AK.35MagnioursiliteMg4(UO2)4(Si2O5)5(OH)6 · 20H2O
9.AK.35CalcioursiliteCa4(UO2)4(Si2O5)5(OH)6 · 15H2O
9.AK.40UranosiliteUO3 · 7SiO2Orth.

Related Minerals - Dana Grouping (8th Ed.)Hide

53.3.2.2HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OMon.
53.3.2.3MetahaiweeiteCa(UO2)2Si6O15 · nH2O

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.16.1UranosiliteUO3 · 7SiO2Orth.
14.16.2Coffinite(U4+,Th)(SiO4)1-x(OH)4xTet.
14.16.3Soddyite(UO2)2SiO4 · 2H2OOrth.
14.16.4Swamboite-(Nd)Nd0.333[(UO2)(SiO3OH)](H2O)∼2.5Mon.
14.16.6Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2OMon. 2 : P21
14.16.7NatroboltwooditeNa(UO2)(SiO3OH) · H2O
14.16.8CuprosklodowskiteCu(UO2)2(SiO3OH]2 · 6H2OTric. 1 : P1
14.16.9SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2OMon. 2/m : B2/m
14.16.10UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
14.16.11Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2OMon.
14.16.12HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OMon.
14.16.13MetahaiweeiteCa(UO2)2Si6O15 · nH2O
14.16.15SteacyiteK0.3(Na,Ca)2ThSi8O20Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
14.16.16EkaniteCa2ThSi8O20Tet. 4 2 2 : I4 2 2
14.16.17KasolitePb(UO2)[SiO4] · H2OMon. 2/m : P21/b
14.16.18OrlitePb3(UO2)3(Si2O7)2 · 6H2O
14.16.19OursiniteCo(UO2)2(SiO3OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmca

Other InformationHide

Health Risks:
Contains uranium. Always wash hands after handling. Do not lick or ingest. Store in an uninhabited area

References for WeeksiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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., 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) U6+ 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. American Mineralogist: 97: 750-754.

Internet Links for WeeksiteHide

Localities for WeeksiteHide

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

(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; Brugger, J., Meisser, N., Etschmann, B., Ansermet, S., & Pring, A. (2011). Paulscherrerite from the Number 2 Workings, Mount Painter Inlier, Northern Flinders Ranges, South Australia:“Dehydrated schoepite” is a mineral after all. American Mineralogist, 96(2-3), 229-240.
Austria
 
  • Carinthia
    • Millstatt lake ridge
      • Fresach
        • Laas
G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
Brazil
 
  • Minas Gerais
    • 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; D Atencio & R Hypolito ()Fosfatos e silicatos secunderos de uranio de Perus, Sao Paulo
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; Wong, V., Goodell, P. C., & Anthony, E. Y. (1999, January). Characterization of U-series disequilibria at the Pena Blanca natural analogue site, Chihuahua, Mexico. In MRS Proceedings (Vol. 556, p. 801). Cambridge University Press.
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)
Peru
 
  • Puno Department
    • Carabaya Province
Geological Association of Canada (2014) Abstracts Fredericton Vol 37; Li, V. (2016). The Uranium Mineralization of the Macusani District, Southeast Peru: Mineralogy, Geochemistry, Geochronology and Ore-Genetic Model. PhD Thesis Queen’s University, Kingston, Ontario, Canada
Romania
 
  • Suceava Co.
    • Suceava district
Hîrtopanu P., Udubaşa G., Scott P., Hârtopanu I. (2004) Uranium sulphide mineralisation in the Bistriţa Mts., East Carpathians, Romania. Romanian Journal of Mineral Deposits 81:108-111
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
      • Virgin Valley
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.
      • Easton
        • Chestnut Hill (College Hill; Lafayette Hill; Mount Lafayette; Paxinosa Ridge)
          • C.K. Williams Quarry complex (Williams and Company Rock Quarry)
AmMin.45:39; Am Min. 66:610; Am.Min.: 45: 39-52
  • Texas
    • Live Oak Co.
U.S. Geological Survey,2005,Mineral Resources Data System :U.S. Geological Survey,Reston, Virginia
R&M 66:3 pp 196-224
    • Presidio Co.
Am.Min.: 45: 39-52
  • Utah
    • Grand Co.
      • Thompsons District (S. E. Thomsons)
        • Mollie Hogans
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.
      • Lusk
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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