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Dumontite

A valid IMA mineral species - grandfathered
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04205190014977102154550.jpg
Dumontite

Ste Barbe vein, Montmins mining district, Échassières, Vichy, Allier, Auvergne-Rhône-Alpes, France
03757670014977098708253.jpg
Dumontite, etc.

Ste Barbe vein, Montmins mining district, Échassières, Vichy, Allier, Auvergne-Rhône-Alpes, France
04261250014977543818306.jpg
Dumontite, etc.

Ste Barbe vein, Montmins mining district, Échassières, Vichy, Allier, Auvergne-Rhône-Alpes, France
03690190014962218326794.jpg
Dumontite

Ste Barbe vein, Montmins mining district, Échassières, Vichy, Allier, Auvergne-Rhône-Alpes, France
07911570014946295955753.jpg
Dumontite, etc.

Ste Barbe vein, Montmins mining district, Échassières, Vichy, Allier, Auvergne-Rhône-Alpes, France
08438990014947581049982.jpg
Dumontite, etc.

Ste Barbe vein, Montmins mining district, Échassières, Vichy, Allier, Auvergne-Rhône-Alpes, France
04205190014977102154550.jpg
Dumontite

Ste Barbe vein, Montmins mining district, Échassières, Vichy, Allier, Auvergne-Rhône-Alpes, France
03757670014977098708253.jpg
Dumontite, etc.

Ste Barbe vein, Montmins mining district, Échassières, Vichy, Allier, Auvergne-Rhône-Alpes, France
Hide all sections | Show all sections

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.


Unique IdentifiersHide

Mindat ID:
1328
Long-form identifier:
mindat:1:1:1328:0
GUID
(UUID V4):
aabe6d28-d712-40dd-9274-7998da106ca6

IMA Classification of DumontiteHide

IMA status:
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1924
Type description reference:
Schoep, A. (1924) La dumontite, a nouveau minéral radioactif. Comptes rendu de l’Académie des sciences de Paris: 179: 693-695.

Classification of DumontiteHide

Strunz-mindat (2024):
8.EC.15

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

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

19 : Phosphates
11 : Phosphates of U

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
DmtIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

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

Chemistry of DumontiteHide

Mindat Formula:
Pb2(UO2)3O2(PO4)2 · 5H2O
Elements listed:
H, O, P, Pb, U - search for minerals with similar chemistry

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.27 Å(very strong)
3.00 Å(strong to very strong)
2.95 Å(strong to very strong)
3.48 Å(strong)
6.14 Å(moderately strong)
4.20 Å(moderately strong)
3.74 Å(moderately strong)
Comments:
Shinkolobwe, DR Congo. Data from Thoreau et al. (1958).

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47c : [Carbonates, phosphates, borates, nitrates]
47d : [Arsenates, antimonates, selenates, bismuthinates]
47f : [Uranyl (U⁶⁺) minerals]
Geological Setting:
Secondary uranium deposits

Type Occurrence of DumontiteHide

Type Locality:
ⓘ Shinkolobwe Mine, Shinkolobwe, Kambove Territory, Haut-Katanga, DR Congo
Place of Conservation of Type Material:
Muséum national d'Histoire naturelle, Paris.
Associated Minerals at Type Locality:
Torbernite
Reference:
Schoep, A. (1924) La dumontite, a nouveau minéral radioactif. Comptes rendu de l’Académie des sciences de Paris: 179: 693-695.
Download:
http://rruff.info/rruff_1.0/uploads/CRHSAS179_693.pdf

Other Language Names for DumontiteHide

German:Dumontit
Spanish:Dumontita

Relationship of Dumontite to other SpeciesHide

Member of:
Phosphuranylite Group
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)6O4(PO4)4 · 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. 2/m
HügelitePb2(UO2)3(AsO4)2O2 · 5H2OMon. 2/m : P21/m
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. mmm (2/m 2/m 2/m) : Pbca
UpaliteAl(UO2)3(PO4)2O(OH) · 7H2OMon. 2/m : P21/b
VanmeersscheiteU6+(UO2)3(PO4)2(OH)6 · 4H2OOrth. mmm (2/m 2/m 2/m)
YingjiangiteK2Ca(UO2)7(PO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmcm

Common AssociatesHide

Associated Minerals Based on Photo Data:
11 photos of Dumontite associated with MetatorberniteCu(UO2)2(PO4)2 · 8H2O
2 photos of Dumontite associated with TorberniteCu(UO2)2(PO4)2 · 12H2O
1 photo of Dumontite associated with ParsonsitePb2(UO2)(PO4)2
1 photo of Dumontite associated with KolbeckiteScPO4 · 2H2O
1 photo of Dumontite associated with DewindtiteH2Pb3(UO2)6O4(PO4)4 · 12H2O
1 photo of Dumontite associated with UranophaneCa(UO2)2(SiO3OH)2 · 5H2O

Related Minerals - Strunz-mindat GroupingHide

8.EC.05Françoisite-(Nd)(Nd,Ce,Sm)(UO2)3(PO4)2O(OH) · 6H2OMon. 2/m
8.EC.05PhuralumiteAl2[(UO2)3(PO4)2O(OH)](OH)3(H2O)9Mon. 2/m
8.EC.05UpaliteAl(UO2)3(PO4)2O(OH) · 7H2OMon. 2/m : P21/b
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. mmm (2/m 2/m 2/m)
8.EC.10DewindtiteH2Pb3(UO2)6O4(PO4)4 · 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.10RenarditePb(UO2)4(PO4)2(OH)4 · H2OOrth.
8.EC.15HügelitePb2(UO2)3(AsO4)2O2 · 5H2OMon. 2/m : P21/m
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. mmm (2/m 2/m 2/m)
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. mmm (2/m 2/m 2/m) : Pbca
8.EC.40BergeniteCa2Ba4(UO2)9(PO4)6O6 · 16H2OMon. 2/m : P21/b

Fluorescence of DumontiteHide

In UV light:
Greenish (UV).

Other InformationHide

Notes:
Soluble in acids.
Health Risks:
Radioactive

Internet Links for DumontiteHide

References for DumontiteHide

Reference List:
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.
Schoep, A. (1924) La dumontite, a nouveau minéral radioactif. Comptes rendu de l’Académie des sciences de Paris: 179: 693-695.
Foshag, W.F. (1925) New mineral names. American Mineralogist: 10: 131-135.
Billiet, V.L. (1926) Détermination des indices de réfraction de la becquerélite, de la curite, de la kasolite, de la fourmariérite, de la parsonsite, de la dumontite, et de l'ianthinite. Bulletin de la Société française de Minéralogie: 49: 136-140.
Thoreau, J., Van Meerssche, M., Protas, J. (1958) Sur la dumontite de Shinkolobwe (Katanga). Bulletin de la Société française de Minéralogie, 81, 63–65.
Piret, Paul, Piret-Meunier, Jacqueline (1988) Nouvelle détermination de la structure cristalline de la dumontite Pb2[(UO2)3O2(PO4)2]·5H2O. Bulletin de Minéralogie, 111 (5) 439-442 doi:10.3406/bulmi.1988.8090
Jambor, John L., Burke, Ernst A. J. (1989) New Mineral Names. American Mineralogist, 74 (11-12) 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, Peter C. (2005) U6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. The Canadian Mineralogist, 43 (6) 1839-1894 doi:10.2113/gscanmin.43.6.1839
(2023) Dumontite. Handbook of Mineralogy. Mineralogical Society of America

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Australia
 
  • Northern Territory
    • West Arnhem Region
      • Kakadu
Mineralogical Society of America - ...
Henry et al. (1999)
      • South Alligator River
Henry et al. (2005)
Austria
 
  • Salzburg
    • St. Johann im Pongau District
      • Bad Gastein
        • Naßfeld valley
          • Kreuzkogel massif
            • Radhausberg
Auer (2005)
Belgium
 
  • Wallonia
    • Luxembourg
Dejonghe et al. (1982) +1 other reference
DR Congo (TL)
 
  • Haut-Katanga
    • Kambove Territory
      • Shinkolobwe
Schoep (1924) +2 other references
  • Lualaba
    • Mutshatsha
      • Kolwezi
Wilson (2018)
  • South Kivu
    • Mwenga Territory
Dunn et al. (1985)
France
 
  • Auvergne-Rhône-Alpes
    • Allier
      • Vichy
        • Échassières
          • Montmins mining district
54 (in German) +2 other references
Germany
 
  • Bavaria
    • Upper Palatinate
      • Schwandorf District
        • Schwarzach bei Nabburg
          • Wölsendorf
Weiß (1990)
Dill et al. (2010)
  • Saxony
    • Vogtlandkreis
Gröbner et al. (2007) +1 other reference
India
 
  • Tamil Nadu
    • Chengalpattu district
Deepthi et al. (2015)
Italy
 
  • Trentino-Alto Adige (Trentino-South Tyrol)
    • Trento Province (Trentino)
      • Valdaone
        • Daone
          • Daone Valley
            • Limes
Campostrini et al. (2005)
Portugal
 
  • Viseu
    • Mangualde
      • Tavares (Chãs; Várzea e Travanca)
        • Tragos
Alves et al. (2017)
Slovenia
 
  • Gorenja Vas–Poljane
Dolenec (1985)
Tajikistan
 
  • Sughd
    • Ghafurov District
      • Adrasmon (Adrasman)
Soboleva et al. (1957) +1 other reference
USA
 
  • Arizona
    • Santa Cruz County
      • Pajarito Mountains
        • Pajarito Mining District
          • Big Steve - White Oak group
            • Walker Canyon
Granger (1962) +1 other reference
  • Colorado
    • Clear Creek County
Eckel et al. (1997)
Harrison & Wells (1955) +1 other reference
U.S. Geological Survey Bulletin 1032-B +1 other reference
U.S. Geological Survey Professional ... +1 other reference
      • Lawson Mining District (Dumont Mining District; Montana Mining District)
U.S. Geological Survey Professional ... +1 other reference
    • Gilpin County
Eckel et al. (1997)
  • Nevada
    • Clark County
      • Spring Mountains
        • Goodsprings Mining District
Longwell et al. (1965)
          • Shenandoah Peak (Shenandoah Mountain)
Page et al. (1956) +3 other references
  • Pennsylvania
Peter Chin Collection
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