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Sklodowskite

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Marie Skłodowska Curie
Formula:
Mg(UO2)2[HSiO4]2 · 5H2O
System:
Monoclinic
Colour:
Light yellow to ...
Hardness:
2 - 3
Name:
Named after Marie Sklodowska-Curie (1867-1934) who, with her husband Pierre, was a pioneer in the study of radioactivity.

Classification of Sklodowskite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.AK.10

9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
53.3.1.3

53 : NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
3 : Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
14.16.9

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

Year of Discovery:
1924

Occurrences of Sklodowskite

Geological Setting:
Silica bearing waters acting on earlier deposited uranium minerals (uraninite)

Physical Properties of Sklodowskite

Adamantine, Vitreous, Silky
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
earthy when massive
Colour:
Light yellow to green-yellow
Streak:
Yellow
Hardness (Mohs):
2 - 3
Cleavage:
Perfect
on {100}
Density:
3.54 g/cm3 (Measured)    3.51 g/cm3 (Calculated)

Crystallography of Sklodowskite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Space Group Setting:
C2/m
Cell Parameters:
a = 17.382(6) Å, b = 7.047(1) Å, c = 6.610(2) Å
β = 105.88°
Ratio:
a:b:c = 2.467 : 1 : 0.938
Unit Cell Volume:
V 778.77 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Acicular crystals
Twinning:
With {001} or {100} as twin plane

Optical Data of Sklodowskite

Type:
Biaxial (+)
RI values:
nα = 1.613 - 1.615 nβ = 1.635 - 1.642 nγ = 1.656 - 1.657
Max Birefringence:
δ = 0.043
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong r > v
Pleochroism:
Visible
Comments:
X= colorless
Y= yellow
Z= pale yellow

Chemical Properties of Sklodowskite

Formula:
Mg(UO2)2[HSiO4]2 · 5H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Te,Ni,Na,K

Relationship of Sklodowskite 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.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.30WeeksiteK2(UO2)2(Si5O13) · 4H2O
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
14.16.5WeeksiteK2(UO2)2(Si5O13) · 4H2O
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
14.16.10UranophaneCa(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 Sklodowskite

Name in Other Languages:
Simplified Chinese:硅镁铀矿
Spanish:Sklodowskita
Traditional Chinese:矽鎂鈾礦

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 Sklodowskite

Reference List:
American Mineralogist (1925): 10: 132.

D. H. Gorman (1957): Studies of radioactive compounds; IX, Sklodowskite. Can. Mineral. 6, 52-60.

Ryan, R.R. and Rosenzweig, A. (1977) Sklodowskite, MgO.2UO3.2SiO2.7H2O. Crystal Structure Communications: 6: 611-615.

American Mineralogist (1981): 66: 610-625.

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 Sklodowskite

Localities for Sklodowskite

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
    • Coomalie Shire
      • Batchelor
        • Rum Jungle
D A Berkman (1968) The geology of the Rum Jungle Uranium Deposits. Symposium on Uranium Deposits in Australia 1968 pp.12-31
    • West Arnhem Region
      • Kakadu
Economic Geology of Australia and papua New Guinea pp321-326
Angela Giblin (2004) Alligator Rivers Uranium deposits (Koongarra, Nabarlek and Ranger One) Northern Territory. CRC LEME
Econ Geol (1987)82:1152-1168; Angela Giblin (2004) Alligator Rivers Uranium deposits (Koongarra, Nabarlek and Ranger One) Northern Territory. CRC LEME
Brazil
 
  • Bahia
    • Brumado (Bom Jesus dos Meiras)
      • Serra das Éguas
Cassedanne, J.P. & Cassedanne, J.O. (1978): Famous mineral localities: The Brumado district, Bahia , Brazil. Mineralogical Record 9 : 196-205
    • Lagoa Real Uranifera Province
A.M.D.V. Chaves (2005) Mineralogia e Geoquímica Supergênicas do Urânio - Província Uranífera de Lagoa Real, Caetité-Bahia. Dissertação de Mestrado, Comissão Nacional de Energia Nuclear, 101p. (In portuguese with abstract in english)
Canada
 
  • Saskatchewan
    • Athabasca Basin
WATKINSON, D.H., HESLOP, J.B. & EWERT, W.D. (1975) Nickel sulphide-arsenide assemblages associated with uranium mineralization, Zimmer Lake area, Northern Saskatchewan. Canadian Mineralogist 13, 198-204.
China
Shuling Zhang, Gong Chen, and Yuheng Tang (1984): Acta Sedimentologica Sinica 2(4)
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Central Bohemia Region
Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
    • Karlovy Vary Region
      • Krušné Hory Mts (Erzgebirge)
        • Jáchymov District (St Joachimsthal)
Lapis 2002(7/8), 63-65
            • Svornost Mine (Einigkeit Mine)
Jiří Sejkora, Jakub Plášil & Bohuslav Bureš (2013): Neobvyklá asociaci supergenních minerálů uranu ze žíly Jan Evangelista, Jáchymov (Česká republika). [Unusual association of supergene uranium minerals from the Jan Evangelista vein, Jáchymov (Czech Republic)]. Bull. mineral.-petrolog. Odd. Nár. Muz. (Praha) 21, 143-156
    • Liberec Region
      • Harrachov (Harrachsdorf)
Bradna, J., Šita, F.: Nálezy minerál na Rýžovišti u Harrachova. Opera Corcontica, 1968, 5, s. 246-247.
Democratic Republic of Congo (Zaïre)
 
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Kolwezi District
        • Kamoto
S. Wolfsried collection
        • Kolwezi
No reference listed
      • Lubumbashi (Elizabethville)
      • Shinkolobwe
Am Min 66 (1981), 610
      • Swambo
France
 
  • Brittany
    • Morbihan
      • Le Faouët
        • Berné
R. Pierrot, L. Chauris, C. Laforêt and F. Pillard : "Inventaire Minéralogique de la France N° 9 : Morbihan", BRGM, 1980.
      • Pontivy
        • Guern
Le Règne Minéral, Hors Série IV (1998)
  • Languedoc-Roussillon
    • Hérault
      • Lodève
[Le Règne Minéral 1997, 13, p.5-18]
Le Règne Minéral, Hors Série IV (1998)
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Menzenschwand
Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
  • Bavaria
    • Franconia
      • Fichtelgebirge
        • Weißenstadt
          • Großschloppen
Gunnar Farber
    • Upper Palatinate
      • Wölsendorf Fluorite Mining District
        • Wölsendorf East District
          • Schwarzach bei Nabburg
            • Wölsendorf
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
  • Rhineland-Palatinate
    • Hunsrück
      • Birkenfeld
        • Ellweiler
Aufschluss 69/(7+8), Lapis 79/(7+8)
  • Saxony
    • Vogtland
      • Oelsnitz
Gröbner, J. and Kolitsch, U. (2007): The minerals of the uranium prospect at Tirpersdorf, Vogtland. Lapis 32, 37-42; 58. (in German)
  • Thuringia
    • Gera
      • Ronneburg U deposit
T. Witzke & F. Rüger: Lapis 1998(7/8), 26-64
Mexico
 
  • Chihuahua
    • Mun. de Aquiles Serdán
      • Santa Eulalia District
        • West Camp
          • Francisco Portillo
Panczner(1987):220 & 284.
New Zealand
 
  • South Island
    • Buller River
Christie & Brathwaite, (2000) NZ Mineral Commodity Report 19 - Beryllium, Gallium, Lithium, Magnesium, Uranium and Zirconium
Switzerland
 
  • Wallis (Valais)
    • Le Trient Valley
      • Les Marécottes
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 374.
Tajikistan
 
  • Viloyati Sogd (Viloyati Sughd; Viloyati Khodzhent; Viloyati Leninabad)
    • Khodzhent (Leninabad)
      • Kyzyltyube-Sai
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
USA
 
  • Alaska
    • Prince of Wales-Outer Ketchikan Borough
      • Ketchikan District
        • Prince of Wales Island
          • Bokan Mountain
U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
  • California
    • San Bernardino Co.
      • Bristol Mts
        • Amboy
W. Wise - X-ray work at U.C. Santa Barbara
  • Colorado
    • Saguache Co.
      • Marshall Pass District
Minerals of Colorado (1997) E.B. Eckels
  • Michigan
    • Gogebic Co.
      • Watersmeet
Travis Olds collection
  • New Hampshire
    • Grafton Co.
      • Grafton
Frondel, C., 1956, Mineral Composition of Gummite, American Mineralogist, v. 41, p. 539-568.
  • New Mexico
    • Cibola Co.
Northrop, Minerals of New Mexico, 3rd. rev. ed. (1996)
NMBMMR Memoir 15 Geology and Technology of the Grants Uranium Region
    • McKinley Co.
Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
    • Socorro Co.
      • San Lorenzo District
Patrick Haynes
  • New York
    • Essex Co.
      • Crown Point Township
Jensen (1978) Minerals of New York State
George Robinson & Steven Chamberlain (2007) Gazetteer of major New York State mineral localities. Rocks & Minerals, 82, #6, 472-483.
  • Pennsylvania
    • Carbon Co.
      • Jim Thorpe (Mauch Chunk)
Geyer, A.R., Smith, R.C. & Barnes, J.H. (1976) Mineral Collecting in Pennsylvania.
  • Utah
    • Juab Co.
UGMS Bull 117 Minerals and Mineral Localities of Utah; USGS Prof Paper 455 p57
Rocks & Minerals: 68(6): 381-393.
    • Piute Co.
      • Marysvale District (Marysvale Uranium area)
UGMS Bull 117 Minerals and Mineral Localities of Utah
    • San Juan Co.
      • White Canyon District
        • White Canyon
Can Min (2001) 39, 6, 1685-1689
    • Wayne Co.
      • Fremont District
        • Fruita
UGMS Bull 117 Minerals and Mineral Localities of Utah
  • Washington
    • Stevens Co.
      • Spokane Indian Reservation
        • Turtle Lake
Cannon, B. (1975): Minerals of Washington, p.53
Mineral and/or Locality  
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