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Weeksite

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Goanikontes Claim, Arandis, Swakopmund District, Erongo Region, Namibia
© Elmar Lackner

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Formula:
K
 
2
(UO
 
2
)
 
2
(Si
 
2
O
 
5
)
 
3
 · 4H
 
2
O
System:OrthorhombicColour:Yellow
Hardness:1 - 2
Name:Named after Alice Mary Dowse Weeks (1909-1988), professor of mineralogy, Temple University (Philadelphia, USA).
This page provides mineralogical data about Weeksite.

Classification of Weeksite

IMA status:Approved
Strunz 8th edition ID:8/H.37-10
Nickel-Strunz 10th (pending) edition ID:9.AK.30

9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
Dana 8th edition ID: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)
Hey's CIM Ref.:14.16.5

14 : Silicates not Containing Aluminum
16 : Silicates of U
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Type Occurrence of Weeksite

Type Locality:Autunite #8 claim, Topaz Mountain, Thomas Range, Juab Co., Utah, USA
Year of Discovery:1960

Physical Properties of Weeksite

Lustre: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°
Maximum Birefringence:δ = 0.010

Chart 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:
K
 
2
(UO
 
2
)
 
2
(Si
 
2
O
 
5
)
 
3
 · 4H
 
2
O
Essential elements:H, K, O, Si, U
All elements listed in formula:H, K, O, Si, U
Common Impurities:Al,Fe,Ca,Ba,Na,C

Relationship of Weeksite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AK.05Soddyite
(UO
 
2
)
 
2
SiO
 
4
 · 2H
 
2
O
9.AK.10Cuprosklodowskite
Cu(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 6H
 
2
O
9.AK.10Oursinite
(Co,Mg)(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 6H
 
2
O
9.AK.10Sklodowskite
Mg(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 5H
 
2
O
9.AK.15Boltwoodite
(K,Na)(UO
 
2
)[HSiO
 
4
] · 0.5H
 
2
O
9.AK.15Kasolite
Pb(UO
 
2
)[SiO
 
4
] · H
 
2
O
9.AK.15Natroboltwoodite
(H
 
3
O)(Na,K)UO
 
2
SiO
 
4
 · H
 
2
O
9.AK.15Uranophane
Ca(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 5H
 
2
O
9.AK.15Beta-Uranophane
9.AK.20Swamboite
UH
 
6
(UO
 
2
)
 
6
(SiO
 
4
)
 
6
 · 30H
 
2
O
9.AK.25Haiweeite
Ca(UO
 
2
)
 
2
[Si
 
5
O
 
12
(OH)
 
2
] · 4.5H
 
2
O
9.AK.25Metahaiweeite
Ca(UO
 
2
)
 
2
Si
 
6
O
 
15
 · nH
 
2
O
9.AK.25Ranquilite
9.AK.30Coutinhoite
Th
 
x
Ba
 
(1-2x)
(UO
 
2
)
 
2
Si
 
5
O
 
13
 · (H
 
2
O)
 
1+y
 (0 < x < 0.5 and 0 < y < (2+x))
9.AK.35Ursilite
(Mg,Ca)
 
4
(UO
 
2
)
 
4
(Si
 
2
O
 
5
)
 
5.5
(OH)
 
5
 · 13H
 
2
O
9.AK.35Magnioursilite
Mg
 
4
(UO
 
2
)
 
4
(Si
 
2
O
 
5
)
 
5
(OH)
 
6
 · 20H
 
2
O
9.AK.35Calcioursilite
Ca
 
4
(UO
 
2
)
 
4
(Si
 
2
O
 
5
)
 
5
(OH)
 
6
 · 15H
 
2
O
9.AK.40Uranosilite
UO
 
3
 · 7SiO
 
2
Related Minerals - Hey's Index Grouping:

- +
14.16.1Uranosilite
UO
 
3
 · 7SiO
 
2
14.16.2Coffinite
(U
4+
 
,Th)(SiO
 
4
)
 
1-x
(OH)
 
4x
14.16.3Soddyite
(UO
 
2
)
 
2
SiO
 
4
 · 2H
 
2
O
14.16.4Swamboite
UH
 
6
(UO
 
2
)
 
6
(SiO
 
4
)
 
6
 · 30H
 
2
O
14.16.6Boltwoodite
(K,Na)(UO
 
2
)[HSiO
 
4
] · 0.5H
 
2
O
14.16.7Natroboltwoodite
(H
 
3
O)(Na,K)UO
 
2
SiO
 
4
 · H
 
2
O
14.16.8Cuprosklodowskite
Cu(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 6H
 
2
O
14.16.9Sklodowskite
Mg(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 5H
 
2
O
14.16.10Uranophane
Ca(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 5H
 
2
O
14.16.11β-Uranophane
Ca(UO
 
2
)
 
2
(HSiO
 
4
)
 
2
 · 5H
 
2
O
14.16.12Haiweeite
Ca(UO
 
2
)
 
2
[Si
 
5
O
 
12
(OH)
 
2
] · 4.5H
 
2
O
14.16.13Metahaiweeite
Ca(UO
 
2
)
 
2
Si
 
6
O
 
15
 · nH
 
2
O
14.16.14Thorogummite
(Th,U)(SiO
 
4
)
 
1-x
(OH)
 
4-x
14.16.15Steacyite
(◻,K)(Na,Ca)
 
2
(Th,U)[Si
 
8
O
 
20
]
14.16.16Ekanite
(Ca,Fe
2+
 
,Pb)
 
2
(Th,U)[Si
 
8
O
 
20
]
14.16.17Kasolite
Pb(UO
 
2
)[SiO
 
4
] · H
 
2
O
14.16.18 Orlite
Pb
 
3
(UO
 
2
)
 
3
(Si
 
2
O
 
7
)
 
2
 · 6H
 
2
O
14.16.19Oursinite
(Co,Mg)(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 6H
 
2
O

Other Names for Weeksite

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

Other Information

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

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.

Internet Links for Weeksite

Search Engines:
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    • External Links:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Weeksite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
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  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
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    • Localities for Weeksite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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
          • Mt Painter area
            • Radium Ridge
    		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
    • São Paulo
      • São Paulo
    		Revista Brasileira de Geociências 24(1):43-51, March 1994
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Krušné Hory Mts (Erzgebirge)
          • Jáchymov (St Joachimsthal) District
    		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 Mts
          • 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
        • Arandis
    		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.
    		Am.Min.: 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
    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
    • 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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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 19th Jun 2011 01:17:23
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