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Dumontite

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About DumontiteHide

02240730014948767545170.jpg
André Dumont
Formula:
Pb2(UO2)3O2(PO4)2 · 5H2O
Colour:
Golden yellow to ocher yellow
Specific Gravity:
5.65
Crystal System:
Monoclinic
Name:
Named in honor of André Dumont (15 February 1809, Liège, Belgium - 28 February 1857, Liège, Belgium), geologist. He travelled 90,000 km on foot and horseback to publish a geological map of Belgium on 1/160,000. He was also awarded the Wollaston Medal in 1840.
A secondary uranium mineral.


Classification of DumontiteHide

Approved, 'Grandfathered' (first described prior to 1959)
First published:
1924
8.EC.15

8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
C : UO2:RO4 = 3:2
42.4.5.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq·xH2O
19.11.38

19 : Phosphates
11 : Phosphates of U

Physical Properties of DumontiteHide

Transparency:
Translucent
Colour:
Golden yellow to ocher yellow
Streak:
Light yellow
Density:
5.65(4) g/cm3 (Measured)    5.666 g/cm3 (Calculated)

Optical Data of DumontiteHide

Type:
Biaxial (+)
RI values:
nα = 1.850 nβ = 1.870 nγ = 1.890
Max Birefringence:
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
strong r < v
Pleochroism:
Visible
Comments:
X = a = Pale yellow
Y = c =
Z = b = Deep yellow

Chemical Properties of DumontiteHide

Formula:
Pb2(UO2)3O2(PO4)2 · 5H2O

Crystallography of DumontiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 8.118(6) Å, b = 16.819(8) Å, c = 6.983(3) Å
β = 109.03(5)°
Ratio:
a:b:c = 0.483 : 1 : 0.415
Unit Cell V:
901.33 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals small, elongated [001] and flattened {010} to 1.5 mm. May form stellate aggregates.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0012090DumontitePiret P, Piret-Meunier J (1988) Nouvelle determination de la structure cristalline de la dumonite Pb2[(UO2)3O2(PO4)2]*5H2O Bulletin de Mineralogie 111 439-4421988Shinkolobwe, Shaba, Zaire0293
CIF Raw Data - click here to close

Geological EnvironmentHide

Geological Setting:
Secondary uranium deposits

Type Occurrence of DumontiteHide

Place of Conservation of Type Material:
Muséum national d'Histoire naturelle, Paris
Associated Minerals at Type Locality:
Reference:
Schoep, A. (1924) La dumontite, a nouveau minéral radioactif. Comptes rendu de l’Académie des sciences de Paris: 179: 693-695.

Other Language Names for DumontiteHide

German:Dumontit
Spanish:Dumontita

Relationship of Dumontite to other SpeciesHide

Other Members of this group:
AlthupiteAlTh(UO2)7(PO4)4(OH)5O2 · 15H2OTric. 1 : P1
BergeniteCa2Ba4(UO2)9(PO4)6O6 · 16H2OMon. 2/m : P21/b
DewindtiteH2Pb3(UO2)2(PO4)4O4 · 12H2OOrth. mmm (2/m 2/m 2/m) : Cmma
Françoisite-(Ce)(Ce,Nd,Ca)(UO2)3(PO4)2O(OH) · 6H2OMon. 2/m : P21/b
Françoisite-(Nd)(Nd,Ce,Sm)(UO2)3(PO4)2O(OH) · 6H2OMon.
HügelitePb2(UO2)3(AsO4)2O2 · 5H2OMon.
PhosphuranyliteKCa(H3O)3(UO2)7(PO4)4O4 · 8H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
PhuralumiteAl2[(UO2)3(PO4)2O(OH)](OH)3(H2O)9Mon. 2/m
PhurcaliteCa2(UO2)3(PO4)2O2 · 7H2OOrth.
UpaliteAl(UO2)3(PO4)2O(OH) · 7H2OMon.
VanmeersscheiteU6+(UO2)3(PO4)2(OH)6 · 4H2OOrth.
YingjiangiteK2Ca(UO2)7(PO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmcm

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Dumontite associated with MetatorberniteCu(UO2)2(PO4)2 · 8H2O
1 photo of Dumontite associated with TorberniteCu(UO2)2(PO4)2 · 12H2O
1 photo of Dumontite associated with ParsonsitePb2(UO2)(PO4)2

Related Minerals - Nickel-Strunz GroupingHide

8.EC.05Françoisite-(Nd)(Nd,Ce,Sm)(UO2)3(PO4)2O(OH) · 6H2OMon.
8.EC.05PhuralumiteAl2[(UO2)3(PO4)2O(OH)](OH)3(H2O)9Mon. 2/m
8.EC.05UpaliteAl(UO2)3(PO4)2O(OH) · 7H2OMon.
8.EC.05Françoisite-(Ce)(Ce,Nd,Ca)(UO2)3(PO4)2O(OH) · 6H2OMon. 2/m : P21/b
8.EC.10ArsenuranyliteCa(UO2)4(AsO4)2(OH)4 · 6H2OOrth.
8.EC.10DewindtiteH2Pb3(UO2)2(PO4)4O4 · 12H2OOrth. mmm (2/m 2/m 2/m) : Cmma
8.EC.10KivuiteTh(UO2)4(PO3OH)2(OH)8 · 7H2O
8.EC.10PhosphuranyliteKCa(H3O)3(UO2)7(PO4)4O4 · 8H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
8.EC.10YingjiangiteK2Ca(UO2)7(PO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
8.EC.15HügelitePb2(UO2)3(AsO4)2O2 · 5H2OMon.
8.EC.20MetavanmeersscheiteU6+(UO2)3(PO4)2(OH)6 · 2H2OOrth. mmm (2/m 2/m 2/m) : Fddd
8.EC.20VanmeersscheiteU6+(UO2)3(PO4)2(OH)6 · 4H2OOrth.
8.EC.20ArsenovanmeersscheiteU6+(UO2)3(AsO4)2(OH)6 · 4H2OOrth. mm2 : Pmn21
8.EC.25AlthupiteAlTh(UO2)7(PO4)4(OH)5O2 · 15H2OTric. 1 : P1
8.EC.30MunditeAl(UO2)3(PO4)2(OH)3 · 5.5H2OOrth.
8.EC.35PhurcaliteCa2(UO2)3(PO4)2O2 · 7H2OOrth.
8.EC.40BergeniteCa2Ba4(UO2)9(PO4)6O6 · 16H2OMon. 2/m : P21/b

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

42.4.5.2HügelitePb2(UO2)3(AsO4)2O2 · 5H2OMon.
42.4.5.3BergeniteCa2Ba4(UO2)9(PO4)6O6 · 16H2OMon. 2/m : P21/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.11.1LermontoviteU(PO4)(OH) · H2OOrth. mmm (2/m 2/m 2/m) : Ccca
19.11.2MetavanmeersscheiteU6+(UO2)3(PO4)2(OH)6 · 2H2OOrth. mmm (2/m 2/m 2/m) : Fddd
19.11.3VanmeersscheiteU6+(UO2)3(PO4)2(OH)6 · 4H2OOrth.
19.11.4Chernikovite(H3O)2(UO2)2(PO4)2 · 6H2OTet.
19.11.5VyacheslaviteU(PO4)(OH)Orth. mmm (2/m 2/m 2/m) : Cmca
19.11.6MetanatroautuniteNa(UO2)(PO4)(H2O)3Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
19.11.7YingjiangiteK2Ca(UO2)7(PO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
19.11.8Meta-ankoleiteK2(UO2)2(PO4)2 · 6H2OTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
19.11.9Uramphite(NH4)2(UO2)2(PO4)2 · 6H2OTet.
19.11.10TorberniteCu(UO2)2(PO4)2 · 12H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm
19.11.11MetatorberniteCu(UO2)2(PO4)2 · 8H2OTet. 4/m : P4/n
19.11.12SaléeiteMg(UO2)2(PO4)2 · 10H2OMon. 2/m
19.11.13Ningyoite(U,Ca,Ce)2(PO4)2 · 1-2H2OOrth.
19.11.14Meta-autuniteCa(UO2)2(PO4)2 · 6H2OTet. 4/mmm (4/m 2/m 2/m)
19.11.15AutuniteCa(UO2)2(PO4)2 · 10-12H2OOrth. mmm (2/m 2/m 2/m) : Pnma
19.11.16Pseudo-autunite(H3O)4Ca2(UO2)2(PO4)4 · 5H2OOrth.
19.11.17PhurcaliteCa2(UO2)3(PO4)2O2 · 7H2OOrth.
19.11.18PhosphuranyliteKCa(H3O)3(UO2)7(PO4)4O4 · 8H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
19.11.19UlrichiteCaCu(UO2)(PO4)2 · 4H2OMon.
19.11.20BergeniteCa2Ba4(UO2)9(PO4)6O6 · 16H2OMon. 2/m : P21/b
19.11.21Metauranocircite-IBa(UO2)2(PO4)2 · 7H2OMon. 2 : P21
19.11.22UranocirciteBa(UO2)2(PO4)2 · 10H2OTet.
19.11.23RanunculiteHAl(UO2)(PO4)(OH)3 · 4H2OMon.
19.11.24TrianguliteAl3(UO2)4(PO4)4(OH)5 · 5H2OTric.
19.11.25MunditeAl(UO2)3(PO4)2(OH)3 · 5.5H2OOrth.
19.11.26UpaliteAl(UO2)3(PO4)2O(OH) · 7H2OMon.
19.11.27FurongiteAl13(UO2)7(PO4)13(OH)14 · 58H2OTric. 1 : P1
19.11.28ThreadgolditeAl(UO2)2(PO4)2(OH) · 8H2OMon.
19.11.29PhuralumiteAl2[(UO2)3(PO4)2O(OH)](OH)3(H2O)9Mon. 2/m
19.11.30MoreauiteAl3(UO2)(PO4)3(OH)2 · 13H2OMon. 2/m : P21/b
19.11.31SabugaliteHAl(UO2)4(PO4)4 · 16H2OMon. 2/m : B2/m
19.11.32Uranospathite(Al,◻)(UO2)2(PO4)2F · 20(H2O,F)Orth. mm2 : Pnn2
19.11.33AlthupiteAlTh(UO2)7(PO4)4(OH)5O2 · 15H2OTric. 1 : P1
19.11.34Françoisite-(Nd)(Nd,Ce,Sm)(UO2)3(PO4)2O(OH) · 6H2OMon.
19.11.35KivuiteTh(UO2)4(PO3OH)2(OH)8 · 7H2O
19.11.36ParsonsitePb2(UO2)(PO4)2Tric. 1 : P1
19.11.37DewindtiteH2Pb3(UO2)2(PO4)4O4 · 12H2OOrth. mmm (2/m 2/m 2/m) : Cmma
19.11.39PrzhevalskitePb2(UO2)3(PO4)2(OH)4 · 3H2OOrth.
19.11.40LehneriteMn2+(UO2)2(PO4)2 · 8H2OMon.
19.11.41BassetiteFe2+(UO2)2(PO4)2 · 10H2OMon. 2/m
19.11.42Vochtenite(Fe2+,Mg)Fe3+(UO2)4(PO4)4(OH) · 12-13H2OMon.

Fluorescence of DumontiteHide

Greenish (UV).

Other InformationHide

Notes:
Soluble in acids.
Health Risks:
Radioactive

References for DumontiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schoep, A. (1924) La dumontite, a nouveau minéral radioactif. Comptes rendu de l’Académie des sciences de Paris: 179: 693-695.
Schoep, A. (1924) Musée du Congo belge, Tervueren, Belgium, Annales: part 2: 1: 32.
Foshag, W.F. (1925) New mineral names. American Mineralogist: 10: 131-135.
Billiet, V.L. (1926) Bulletin de la Société française de Minéralogie: 49: 136.
Piret, P., Piret-Meunier, J. (1988) Nouvelle détermination de la structure cristalline de la dumontite Pb2[(UO2)3O2(PO4)2]·5H2O. Bulletin de Mineralogie: 111: 439-442.
Jambor, J.L., Burke, E.A.J. (1989) New mineral names. American Mineralogist: 74: 1399-1404.
Locock, A.J., Burns, P.C. (2003) The structure of hügelite, an arsenate of the phosphuranylite group, and its relationship to dumontite. Mineralogical Magazine: 67: 1109-1120.
Burns, P.C. (2005) U6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Internet Links for DumontiteHide

Localities for DumontiteHide

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.
Australia
 
  • Northern Territory
    • West Arnhem Region
      • Kakadu
Handbook of Mineralogy
      • 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
Austria
 
  • Salzburg
    • St. Johann im Pongau District
      • Bad Gastein
        • Naßfeld valley
          • Kreuzkogel massif
            • Radhausberg
Auer, Ch. (2005)
Belgium
 
  • Wallonia
    • Luxembourg
Dejonghe, L., Charlet, J.-M., Dupuis, C. (1982) L'anomalie radioactive de Daverdisse et les minéraux uranifères associés. Annales de la Société géologique de Belgique, 105(2), 177-193.; http://perso.infonie.be/jose.dehove/photos/Daverdisse.htm
DR Congo (TL)
 
  • Haut-Katanga
    • Kambove District
      • Shinkolobwe
Schoep, A. (1924) La dumontite, nouveau minéral radioactif. Comptes Rendus de l'Académie des Sciences de Paris, 179, 693-695.; Palache, C., Berman, H., Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 929.; Deliens, M. (1996) Overzicht van de mineralogie van de koper-, kobalt- en uraniumvoorkomens in Zuid-Shaba (Zaïre). Pages 35-49 in: Schatten der Aarde. Van mineraal tot juweel. Tentoonstelling in de abdij Saint-Gérard de Brogne van 27 april tot 27 oktober 1996. Catalogus opgemaakt onder de leiding van R. Warin, AGAB en P. Van hee, MKA (in Dutch).
  • Lualaba
    • Kolwezi mining district
      • Kolwezi
Wilson, W. E. (2018) The Musonoi mine, Kolwezi District, Lualaba Province, Democratic Republic of the Congo. Mineralogical Record 49:236-304
  • South Kivu
    • Shabunda Territory
Dunn P J, Gobel V, Grice J D, Puziewicz J, Shigley J E, Vanko D A, Zilczer J (1985) New mineral names, American Mineralogist 70, 436-441
France
 
  • Auvergne-Rhône-Alpes
    • Allier
      • Vichy
        • Échassières
XRD & EDS probed - M.E. Ciriotti collection (2005); Kolitsch, U., Gröbner, J. & Brandstätter, F. (2009): Neufunde von Les Montmins, Allier, Frankreich. Lapis 34 (11), 24-32; 54 (in German).
Germany
 
  • Bavaria
    • Upper Palatinate
      • Schwandorf District
        • Schwarzach bei Nabburg
          • Wölsendorf
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
Dill, H. G., & Weber, B. (2010). Accessory minerals of fluorite and their implication regarding the environment of formation (Nabburg–Wölsendorf fluorite district, SE Germany), with special reference to fetid fluorite (“Stinkspat”). Ore Geology Reviews, 37(2), 65-86.
  • Saxony
    • Vogtlandkreis
Gröbner, J. and Kolitsch, U. (2007): The minerals of the uranium prospect at Tirpersdorf, Vogtland. Lapis 32, 37-42; 58. (in German)
India
 
  • Tamil Nadu
    • Chengalpattu district
Deepthi, K., Natesan, U., Muthulakshmi, A. L., Ferrer, V. A., Venugopalan, V. P., & Narasimhan, S. V. (2015). Mineralogical characterization in the marine environment of Kalpakkam, Southeast coast of India. Marine Georesources & Geotechnology, 33(6), 496-503.
Italy
 
  • Trentino-Alto Adige
    • Trento Province (Trentino)
      • Valdaone
        • Daone
          • Daone Valley
            • Limes
Campostrini, I., Demartin, F., Gramaccioli, C.M. (2005): Val Daone. Minerali secondari del giacimento uranifero presso Limes, Daone (TN). Rivista Mineralogica Italiana, 4/2005, 228-240.
Portugal
 
  • Viseu
    • Mangualde
      • Tavares (Chãs, Várzea e Travanca)
        • Tragos
Alves, P., Marques de Sa, J., and Marques de Sa, C. (2017) Minéralogie de la mine de Pinhal do Souto, Mangualde, Région centre, Portugal. Le Règne Minéral, 138, 42-54
Slovenia
 
  • Gorenja Vas–Poljane
Dolenec, T. (1985): Secondary uranium minerals from the Zirovski Vrh uranium ore deposit. Rudarsko-Metalurski Zbornik 32, 195-206 (in Serbo-Croatian)
Tajikistan
 
  • Sughd
    • Ghafurov District
      • Adrasman
        • Karamazar Mountains
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
USA
 
  • Arizona
    • Santa Cruz Co.
      • Pajarito Mountains
        • Pajarito Mining District
          • Big Steve - White Oak group
            • Walker Canyon
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 209, 266; Granger, H.C. & R.B. Raup (1962), Recon. Study of Uranium Deposits in AZ, USGS Bull. 1147-A: 42-44.
  • Colorado
    • Clear Creek Co.
Minerals of Colorado (1997) Eckel, E. B.
Minerals of Colorado (1997) Eckel, E. B.; Harrison & Wells(1955) USGS Trace element investigations reports 295.
U.S. Geological Survey Bulletin 1032-B; Harrison & Wells(1955) USGS Trace element investigations reports 295.
Minerals of Colorado (1997) Eckel, E. B.; U.S. Geological Survey Professional Paper 371
      • Lawson Mining District (Dumont Mining District; Montana Mining District)
Minerals of Colorado (1997) Eckel, E. B.; U.S. Geological Survey Professional Paper 371
    • Gilpin Co.
Minerals of Colorado (1997) Eckel, E. B.
  • Nevada
    • Clark Co.
      • Spring Mountains
        • Goodsprings Mining District
NBMG Bull 62 Geology and Mineral Deposits of Clark County, Nevada
          • Shenandoah Peak (Shenandoah Mountain)
NBMG Spec. Pub. 31 Minerals of Nevada; Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp97-103
 
Mineral and/or Locality  
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