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About SoddyiteHide

Frederick Soddy
(UO2)2SiO4 · 2H2O
Canary-yellow, amber-yellow
Vitreous, Greasy, Dull
3 - 4
Crystal System:
Named in honor of Frederick Soddy (2 September 1877, Eastbourne, Sussex, England – 22 September 1956, Brighton, Sussex, England), physicist and radiochemist. He received the 1921 Nobel Prize in chemistry for his work on radioactive decay and isotopes.

See also: http://www.mindat.org/article.php/2163/Note+on+soddyite
A triclinic(?) uranyl silicate emineral with a powder XRD pattern close to soddyite was reported by Stohl & Smith (1981).

Classification of SoddyiteHide

Approved, 'Grandfathered' (first described prior to 1959)

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

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

14 : Silicates not Containing Aluminum
16 : Silicates of U

Physical Properties of SoddyiteHide

Vitreous, Greasy, Dull
Transparent, Translucent, Opaque
Canary-yellow, amber-yellow
3 - 4 on Mohs scale

Optical Data of SoddyiteHide

Biaxial (-)
RI values:
nα = 1.650 - 1.654 nβ = 1.685 nγ = 1.699 - 1.715
Max Birefringence:
δ = 0.049 - 0.061
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
relatively weak

Chemical Properties of SoddyiteHide

(UO2)2SiO4 · 2H2O
IMA Formula:
(UO2)2(SiO4) · 2H2O

Crystallography of SoddyiteHide

Crystal System:
Cell Parameters:
a = 8.32 Å, b = 11.21 Å, c = 18.71 Å
a:b:c = 0.742 : 1 : 1.669
Unit Cell V:
1,745.03 ų (Calculated from Unit Cell)

Type Occurrence of SoddyiteHide

Synonyms of SoddyiteHide

Other Language Names for SoddyiteHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
Curite24 photos of Soddyite associated with Curite on mindat.org.
Swamboite-(Nd)10 photos of Soddyite associated with Swamboite-(Nd) on mindat.org.
Uranophane9 photos of Soddyite associated with Uranophane on mindat.org.
Cuprosklodowskite6 photos of Soddyite associated with Cuprosklodowskite on mindat.org.
Torbernite5 photos of Soddyite associated with Torbernite on mindat.org.
Uraninite5 photos of Soddyite associated with Uraninite on mindat.org.
Kasolite4 photos of Soddyite associated with Kasolite on mindat.org.
Metatorbernite4 photos of Soddyite associated with Metatorbernite on mindat.org.
Rutherfordine4 photos of Soddyite associated with Rutherfordine on mindat.org.
Heterogenite4 photos of Soddyite associated with Heterogenite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

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. 2/m : P21/b
9.AK.15UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
9.AK.15Beta-UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
9.AK.25HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
9.AK.25MetahaiweeiteCa(UO2)2Si6O15 · nH2O
9.AK.30WeeksiteK2(UO2)2(Si5O13) · 4H2OOrth.
9.AK.30CoutinhoiteThxBa(1-2x)(UO2)2Si5O13 · (H2O)1+y (0 < x < 0.5 and 0 < y < (2+x))Orth.
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 · 7SiO2Orth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.16.1UranosiliteUO3 · 7SiO2Orth.
14.16.2CoffiniteU(SiO4) · nH2OTet.
14.16.5WeeksiteK2(UO2)2(Si5O13) · 4H2OOrth.
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. 2/m : P21/b
14.16.12HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
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. Avoid inhaling dust when handling or breaking. Never lick or ingest. Avoid prolonged exposure in proximity of the body. Store away from inhabited areas.

References for SoddyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schoep, A. (1922) La soddite, nouveau minéral radioactif. Comptes Rendus de l'Académie des Sciences de la terres et des plantètes: 174: 1066-1067. [as soddite]
American Mineralogist (1922): 7: 179.
Stohl, F.V., Smith, D.K. (1981) The crystal chemistry of the uranyl silicate minerals. American Mineralogist: 66: 615-625.
Demartin, F., Gramaccioli, C.M., Pilati, T. (1992) The importance of accurate crystal structure determination of uranium minerals. II. Soddyite (UO2)2(SiO4)·2H2O. Acta Crystallographica: C48: 1-4.
Burns, P.C. (2005) U6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.
Plášil, J. (2018): Mineralogy, crystallography and structural complexity of natural uranyl silicates. Minerals, 8, 551. [with refinement of soddyite]

Internet Links for SoddyiteHide

Localities for SoddyiteHide

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.
E. Linares y R. O. Toubes (1960). Los minerales radiactivos de la República Argentina. Primeras Jornadas Geológigas Argentinas, 3, 191-205. San Juan.
E. Linares y R. O. Toubes (1960). Los minerales radiactivos de la República Argentina. Primeras Jornadas Geológigas Argentinas, 3, 191-205. San Juan.
E. Linares y R. O. Toubes (1960). Los minerales radiactivos de la República Argentina. Primeras Jornadas Geológigas Argentinas, 3, 191-205. San Juan.
E. Linares y R. O. Toubes (1960). Los minerales radiactivos de la República Argentina. Primeras Jornadas Geológigas Argentinas, 3, 191-205. San Juan.
  • Northern Territory
    • West Arnhem Region
      • South Alligator River
Henry, D.A., Pogson, R.E. and Williams, P.A. (2005) Threadgoldite from the South Alligator Valley uranium field, Northern Territory, Australia: second world occurrence. , Australian Journal of Mineralogy, 11, 7-11
Henry, D.A., Pogson, R.E. and Williams, P.A. (2005) Threadgoldite from the South Alligator Valley uranium field, Northern Territory, Australia: second world occurrence. , Australian Journal of Mineralogy, 11, 7-11
  • South Australia
    • Flinders Ranges
      • North Flinders Ranges
        • Arkaroola Region (Arkaroola Wilderness Sanctuary; 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.
  • New Brunswick
    • York Co.
      • Prince William Parish
        • Lake George
[MinRec 1991]; WILSON, W.E. (1991) The Lake George antimony mine, New Brunswick. Mineralogical Record 22, 263-267.
  • Ontario
    • Algoma District
      • Elliot Lake area
        • Bouck Township
Robertson, J.A. (1976) The Blind River Uranium Deposits: the ores and their setting. (Ontario Division of Mines, Miscellaneous paper 65)
Czech Republic
  • Karlovy Vary Region
Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
    • Krušné Hory Mts (Erzgebirge)
      • Jáchymov District (St Joachimsthal)
Lapis 2002(7/8), 63-65
  • Plzeň Region
    • Planá u Mariánských Lázní (Plan)
Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
  • Vysočina Region
    • Žďár nad Sázavou District
      • Rožná
Leichmann J. (2007): MS , Mineralogický a petrologický výzkum - - Ústav geologických věd. Brno.
DR Congo
  • Haut-Katanga
    • Kambove District
      • Shinkolobwe
C.R.Acad.Sci.Paris,(1922) 174, 1066-1067
Christophe Boutry and Vic Sapienza specimens
    • Lubumbashi
  • Lualaba
    • Kolwezi District
      • Kamoto
J.W. Anthony, R.A. Bideaux, K.W. Bladh, M.C. Nichols: Handbook of Mineralogy, Vol. V (2003)
Deliens, Michel (1992): Occurrence de roubaultite à Kamoto (Shaba, Zaïre). Bulletin de l'Institut Royal des Sciences Naturelles de Belgique. Sciences de la Terre. 58, 295-296.
      • Kolwezi
Wilson, W. E. (2018) The Musonoi mine, Kolwezi District, Lualaba Province, Democratic Republic of the Congo. Mineralogical Record 49:236-304
  • Red Sea
    • Eastern Desert
      • Central Eastern Desert
El-Naby, H. H. A. (2009). Role of geochemical alteration on the formation of secondary Zr-and U-bearing minerals in El Atshan trachyte, central Eastern Desert, Egypt. Journal of Mineralogical and Petrological Sciences, 104(1), 37-51.
Hussein, H. A., & Bakhit, F. S. (1988). Uranium-Bearing Alkaline Volcanics of North Wadi Kariem and Surroundings, Central Eastern Desert, Egypt. Mining Geology, 38(207), 39-48.
      • Sikait-Zabara region
Yehia H. Dawood (2011) Mineral Chemistry and Genesis of Uranyl Minerals Associated with Psammitic Gneisses, Abu Rusheid Area, South Eastern Desert of Egypt. JKAU: Earth Sci., Vol. 21, No. 1, pp: 137-169
  • Occitanie
    • Hérault
      • Lodève
[Le Cahier des Micromonteurs, 1998, 2, p.13-26]
  • Baden-Württemberg
    • Black Forest
      • St Blasien
        • Menzenschwand
Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
  • Saxony
    • Erzgebirge District
      • Johanngeorgenstadt District
Wittern: "Mineralfundorte in Deutschland", 2001
    • Vogtland
      • Oelsnitz
Wittern: "Mineralfundorte in Deutschland", 2001
  • Sardinia
    • Cagliari metropolitan city (Metropolitan City of Cagliari)
      • Capoterra
Olmi F., Sabelli C., Senesi F., Stara P., 2002. La mineralizzazione uranifera di Arcu su Linnarbu. Riv. Miner. Ital., 3: 148-169.
  • Shiga
Matsubara and Miyawaki (2006) Catalogue of Japanese Minerals.
  • Chihuahua
    • Mun. de Aldama
      • Peña Blanca District
        • Sierra Peña Blanca
Murphy (2006)
http://www.swri.org/4org/d20/ghs/PBlanca/mineral.html; 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.
  • Suceava
    • 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
  • Republic of Karelia
    • Northern Karelia
P.M. Kartashov data
South Africa
  • Northern Cape
    • Namakwa District (Namaqualand)
      • Orange River
Gevers, T. W.; Partridge, F. C.; Joubert, G. K. (1937): The pegmatite area south of the Orange River, Namaqualand. Mem. Geol. Survey, S. Africa, No. 31, 172 pp.
  • Arizona
    • Yavapai Co.
Frondel, C. (1958), Systematic Mineralogy of uranium and thorium, USGS Bull. 1064: 315; Grant, Raymond W., Richard A. Bideaux & Sidney A. Williams (2006), Minerals Added to the Arizona List 1995 to 2005: 8.
  • Colorado
    • Park Co.
      • Lake George (Badger Flats) Area
Minerals of Colorado (1997) Eckel, E. B.
    • Saguache Co.
      • Marshall Pass District
Minerals of Colorado (1997) Eckel, E. B.; Am Min 50:909-923
  • Georgia
    • Lamar Co.
      • Barnesville
Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92
Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92
  • Nevada
    • Humboldt Co.
NBMG Spec. Pub. 31 Minerals of Nevada; Nevada Bureau of Mines and Geology NBMG Open-File Report 96-3 By Stephen B. Castor, Christopher D. Henry, Lisa A. Shevenell
  • New Hampshire
    • Grafton Co.
      • Grafton
Clifford Frondel (1956) Mineral Composition of Gummite, American Mineralogist 41:539-568.; Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index; Korzeb, Stanley L.; Foord, Eugene E. and Lichte, Frederick E. (1997): The chemical evolution and paragenesis of uranium minerals from the Ruggles and Palermo granitic pegmatites, New Hampshire, Canadian Mineralogist: 35: 135-144.
  • New Mexico
    • Cibola Co.
Northrop, Minerals of New Mexico, 3rd. rev. ed. (1996)
NMBMMR Memoir 15 Geology and Technology of the Grants Uranium Region
    • Socorro Co.
Minerals of New Mexico 3rd ed.
McLemore, Virginia T., Zimmerer, Matthew, (2009) Magmatic activity and mineralization along the Capitan, Santa Rita, and Morenci lineaments in the Chupadera Mesa area, central New Mexico. New Mexico Geological Society Fall Field Conference Guidebook – 60 Geology of the Chupadera Mesa pp. 375-386
  • Utah
    • Juab Co.
USGS Prof Paper 455A p57
  • Wyoming
    • Fremont Co.
      • Gas Hills District
Handbook of Mineralogy
Mineral and/or Locality  
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