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Dumontite

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André Dumont
Formula:
Pb2(UO2)3(PO4)2(OH)4 · 3H2O
System:
Monoclinic
Colour:
Golden yellow to ocher ...
Name:
After André Dumont (1809-1857), Belgian geologist.
A secondary uranium mineral.

Classification of Dumontite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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Type Occurrence of Dumontite

Year of Discovery:
1924
Associated Minerals at Type Locality:

Occurrences of Dumontite

Geological Setting:
Secondary uranium deposits

Physical Properties of Dumontite

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

Crystallography of Dumontite

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 Volume:
V 901.33 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals small, elongated [001] and flattened {010} to 1.5mm. May form stellate aggregates.

Optical Data of Dumontite

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 Dumontite

Formula:
Pb2(UO2)3(PO4)2(OH)4 · 3H2O
Essential elements:
All elements listed in formula:

Relationship of Dumontite to other Species

8.EC.05Françoisite-(Nd)(Nd,Ce,Sm)(UO2)3(PO4)2O(OH) · 6H2O
8.EC.05PhuralumiteAl2(UO2)3(PO4)3(OH)2 · 13H2O
8.EC.05UpaliteAl(UO2)3(PO4)2O(OH) · 7H2O
8.EC.05Françoisite-(Ce)(Ce,Nd,Ca)(UO2)3(PO4)2O(OH) · 6H2O
8.EC.10ArsenuranyliteCa(UO2)4(AsO4)2(OH)4 · 6H2O
8.EC.10DewindtiteH2Pb3(UO2)2(PO4)4O4 · 12H2O
8.EC.10Kivuite(Th,Ca,Pb)(UO2)4(HPO4)2(OH)8 · 7H2O
8.EC.10Phosphuranylite(H3O)3KCa(UO2)7(PO4)4O4 · 8H2O
8.EC.10YingjiangiteK2Ca(UO2)7(PO4)4(OH)6 · 6H2O
8.EC.15HügelitePb2(UO2)3(AsO4)2O2 · 5H2O
8.EC.20MetavanmeersscheiteU6+(UO2)3(PO4)2(OH)6 · 2H2O
8.EC.20VanmeersscheiteU6+(UO2)3(PO4)2(OH)6 · 4H2O
8.EC.20ArsenovanmeersscheiteU4+(UO2)3(AsO4)2(OH)2 · 4H2O
8.EC.25AlthupiteAlTh(UO2)7(PO4)4(OH)5O2 · 15H2O
8.EC.30MunditeAl(UO2)3(PO4)2(OH)3 · 5.5H2O
8.EC.35PhurcaliteCa2(UO2)3(PO4)2O2 · 7H2O
8.EC.40BergeniteCa2Ba4(UO2)9(PO4)6O6 · 16H2O
19.11.1LermontoviteU(PO4)(OH) · H2O
19.11.2MetavanmeersscheiteU6+(UO2)3(PO4)2(OH)6 · 2H2O
19.11.3VanmeersscheiteU6+(UO2)3(PO4)2(OH)6 · 4H2O
19.11.4Chernikovite(H3O)2(UO2)2(PO4)2 · 6H2O
19.11.5VyacheslaviteU(PO4)(OH) · nH2O
19.11.6MetanatroautuniteNa(UO2)(PO4)(H2O)3
19.11.7YingjiangiteK2Ca(UO2)7(PO4)4(OH)6 · 6H2O
19.11.8Meta-ankoleiteK2(UO2)2(PO4)2 · 6H2O
19.11.9Uramphite(NH4)2(UO2)2(PO4)2 · 6H2O
19.11.10TorberniteCu(UO2)2(PO4)2 · 12H2O
19.11.11MetatorberniteCu(UO2)2(PO4)2 · 8H2O
19.11.12SaléeiteMg(UO2)2(PO4)2 · 10H2O
19.11.13NingyoiteCaU(PO4)2 · 1-2H2O
19.11.14Meta-autuniteCa(UO2)2(PO4)2 · 6-8H2O
19.11.15AutuniteCa(UO2)2(PO4)2 · 11H2O
19.11.16Pseudo-autunite(H3O)4Ca2(UO2)2(PO4)4 · 5H2O
19.11.17PhurcaliteCa2(UO2)3(PO4)2O2 · 7H2O
19.11.18Phosphuranylite(H3O)3KCa(UO2)7(PO4)4O4 · 8H2O
19.11.19UlrichiteCaCu(UO2)(PO4)2 · 4H2O
19.11.20BergeniteCa2Ba4(UO2)9(PO4)6O6 · 16H2O
19.11.21Metauranocircite-IBa(UO2)2(PO4)2 · 7H2O
19.11.22UranocirciteBa(UO2)2(PO4)2 · 10H2O
19.11.23RanunculiteHAl(UO2)(PO4)(OH)3 · 4H2O
19.11.24TrianguliteAl3(UO2)4(PO4)4(OH)5 · 5H2O
19.11.25MunditeAl(UO2)3(PO4)2(OH)3 · 5.5H2O
19.11.26UpaliteAl(UO2)3(PO4)2O(OH) · 7H2O
19.11.27FurongiteAl13(UO2)7(PO4)13(OH)14 · 58H2O
19.11.28ThreadgolditeAl(UO2)2(PO4)2(OH) · 8H2O
19.11.29PhuralumiteAl2(UO2)3(PO4)3(OH)2 · 13H2O
19.11.30MoreauiteAl3(UO2)(PO4)3(OH)2 · 13H2O
19.11.31SabugaliteHAl(UO2)4(PO4)4 · 16H2O
19.11.32Uranospathite(Al,☐)(UO2)2(PO4)2F · 20(H2O,F)
19.11.33AlthupiteAlTh(UO2)7(PO4)4(OH)5O2 · 15H2O
19.11.34Françoisite-(Nd)(Nd,Ce,Sm)(UO2)3(PO4)2O(OH) · 6H2O
19.11.35Kivuite(Th,Ca,Pb)(UO2)4(HPO4)2(OH)8 · 7H2O
19.11.36ParsonsitePb2(UO2)(PO4)2 · 2H2O
19.11.37DewindtiteH2Pb3(UO2)2(PO4)4O4 · 12H2O
19.11.39PrzhevalskitePb2(UO2)3(PO4)2(OH)4 · 3H2O
19.11.40LehneriteMn2+(UO2)2(PO4)2 · 8H2O
19.11.41BassetiteFe2+(UO2)2(PO4)2 · 8H2O
19.11.42Vochtenite(Fe2+,Mg)Fe3+(UO2)4(PO4)4(OH) · 12-13H2O

Other Names for Dumontite

Name in Other Languages:
German:Dumontit
Spanish:Dumontita

Other Information

Other Information:
Soluble in acids.
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 Dumontite

Reference List:
Schoep (1924) Comptes rendu de l’Académie des sciences de Paris: 179: 693.

Schoep (1924) Musée du Congo belge, Tervueren, Belgium, Annales: part 2: 1: 32.

American Mineralogist (1925): 10: 131.

Billiet (1926) Bulletin de la Société française de Minéralogie: 49: 136.

American Mineralogist (1989): 74: 1403.

Piret, P. and 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.

Locock, A. J. and P. C. Burns (2003b): The structure of hügelite, an arsenate of the phosphuranylite group, and its relationship to dumontite. Mineralogical Magazine, 67, 1109-1120.

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 Dumontite

Localities for Dumontite

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
    • 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
    • Hohe Tauern
      • Gastein valley
        • Naßfeld valley
          • Kreuzkogel massif
            • Radhausberg
Auer, Ch. (2005)
Democratic Republic of Congo (Zaïre) (TL)
 
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Shinkolobwe
C. R. Acad. Sci. Paris (1924): 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.
  • Sud-Kivu
    • Mwenga
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
    • Allier
      • Ébreuil
        • 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
      • Wölsendorf Fluorite Mining District
        • Wölsendorf East District
          • Schwarzach bei Nabburg
            • Wölsendorf
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
  • 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)
Italy
 
  • Trentino-Alto Adige (Trentino-Südtirol)
    • Trento Province
      • Giudicarie Valleys
        • Chiese Valley
          • 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.
Slovenia
 
  • Todraž
Dolenec, T. (1985): Secondary uranium minerals from the Zirovski Vrh uranium ore deposit. Rudarsko-Metalurski Zbornik 32, 195-206 (in Serbo-Croatian)
Tajikistan
 
  • Viloyati Sogd (Viloyati Sughd; Viloyati Khodzhent; Viloyati Leninabad)
    • Adrasman
      • Karamazar Mts
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
USA
 
  • Arizona
    • Santa Cruz Co.
      • Pajarito Mts
        • Pajarito 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) Eckels, E. B.
Minerals of Colorado (1997) Eckels, E. B.
U.S. Geological Survey Bulletin 1032-B
Minerals of Colorado (1997) Eckels, E. B.; U.S. Geological Survey Professional Paper 371
      • Lawson District (Dumont District)
Minerals of Colorado (1997) Eckels, E. B.; U.S. Geological Survey Professional Paper 371
    • Gilpin Co.
Minerals of Colorado (1997) Eckels, E. B.
  • Nevada
    • Clark Co.
      • Spring Mts
        • Goodsprings District
NBMG Bull 62 Geology and Mineral Deposits of Clark County, Nevada
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
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