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Ba(UO2)6O4(OH)6 · 4-8H2O
Yellow to golden-yellow, ...
For Valère Louis Billiet (1903-1944), Belgian crystallographer, University of Ghent, Ghent, Belgium.
This page provides mineralogical data about Billietite.

Classification of Billietite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
B : With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra

7 : AX6O19·xH2O

7 : Oxides and Hydroxides
16 : Oxides of U URL:
Please feel free to link to this page.

Type Occurrence of Billietite

Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA (No. 104455);
National Museum of Natural History, Washington, D.C., USA (No. 160496)
Geological Setting of Type Material:
An alteration product of uraninite

Occurrences of Billietite

Geological Setting:
An uncommon alteration product of uraninite

Physical Properties of Billietite

Diaphaneity (Transparency):
Transparent, Translucent
Yellow to golden-yellow, amber-yellow, orange-yellow
on {001}, imperfect on {110} and {010}
5.28 - 5.36 g/cm3 (Measured)    5.3 g/cm3 (Calculated)

Crystallography of Billietite

Crystal System:
Class (H-M):
mm2 - Pyramidal
Cell Parameters:
a = 12.072Å, b = 30.167Å, c = 7.1455Å
a:b:c = 0.4 : 1 : 0.237
Unit Cell Volume:
V 2,602.22 ų (Calculated from Unit Cell)
Crystals pseudohexagonal, tabular on {001}, may be elongated along [110], to 5 mm
Very common, on {110} and {111}, the latter producing sector-twinned aragonite-like groups
X-Ray Powder Diffraction Data:
7.53 (10)
3.77 (9)
3.17 (8)
2.03 (6)
3.54 (5)
2.49 (4)
2.56 (3)
Recorded on material from Shinkolobwe, Congo

Optical Data of Billietite

Biaxial (-)
RI values:
nα = 1.725 - 1.730 nβ = 1.780 - 1.822 nγ = 1.790 - 1.829
Measured: 36°
Max Birefringence:
δ = 0.065 - 0.099
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
r > v, very strong
X = colourless to pale yellow; Y = Z = greenish yellow to deep golden yellow, amber-brown
Orientation: X = c, Y = a, Z = b

Chemical Properties of Billietite

Ba(UO2)6O4(OH)6 · 4-8H2O
Essential elements:
All elements listed in formula:
Analytical Data:
Chemical analysis of material from Shaba Province, Congo
UO3  (82.76)
SiO2  (0.76)
CaO   (0.30)
BaO   (6.88)
H2O   (8.97)

sum   99.67 wt.-%
Common Impurities:

Relationship of Billietite to other Species

4.GB.05AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2O
4.GB.05CompreignaciteK2(UO2)6O4(OH)6 · 7H2O
4.GB.05RameauiteK2Ca(UO2)6(OH)16 · H2O
4.GB.10BecquereliteCa(UO2)6O4(OH)6 · 8H2O
4.GB.10ProtasiteBa(UO2)3O3(OH)2 · 3H2O
4.GB.15Richetite(Fe3+,Mg)Pb 8.6(UO2)36O36(OH)24•41H2O
4.GB.20BauranoiteBa(UO2)2(OH)6 · 1-2H2O
4.GB.20Calciouranoite(Ca,Ba,Pb)U2O7 · 5H2O
4.GB.20Metacalciouranoite(Ca,Ba,Pb,K2)U2O7 · 2H2O
4.GB.25FourmarieritePb(UO2)4O3(OH)4 · 4H2O
4.GB.30Wölsendorfite(Pb,Ca)U2O7 · 2H2O
4.GB.35MasuyitePb(UO2)3O3(OH)2 · 3H2O
4.GB.40MetavandendriesscheitePbU7O22 · nH2O n < 12
4.GB.40VandendriesscheitePbU7O22 · 12H2O
4.GB.50SayritePb2(UO2)5O6(OH)2 · 4H2O
4.GB.55CuritePb3(UO2)8O8(OH)6 · 3H2O
4.GB.60Iriginite(UO2)Mo2O7 · 3H2O
4.GB.70HolfertiteCaxU6+2-xTi(O8-xOH4x) · 3H2O
7.16.2Schoepite(UO2)8O2(OH)12 · 12H2O
7.16.3ParaschoepiteUO3 · 2H2O
7.16.4MetaschoepiteUO3 · 1-2H2O
7.16.5MetastudtiteUO4 · 2H2O
7.16.6Studtite[(UO2)(O2)(H2O)2] · H2O
7.16.7IanthiniteU4+(UO2)5O7 · 10H2O
7.16.8CompreignaciteK2(UO2)6O4(OH)6 · 7H2O
7.16.11BecquereliteCa(UO2)6O4(OH)6 · 8H2O
7.16.12RameauiteK2Ca(UO2)6(OH)16 · H2O
7.16.13AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2O
7.16.14ProtasiteBa(UO2)3O3(OH)2 · 3H2O
7.16.16BauranoiteBa(UO2)2(OH)6 · 1-2H2O
7.16.17Metacalciouranoite(Ca,Ba,Pb,K2)U2O7 · 2H2O
7.16.18Calciouranoite(Ca,Ba,Pb)U2O7 · 5H2O
7.16.24FourmarieritePb(UO2)4O3(OH)4 · 4H2O
7.16.25Richetite(Fe3+,Mg)Pb 8.6(UO2)36O36(OH)24•41H2O
7.16.26CuritePb3(UO2)8O8(OH)6 · 3H2O
7.16.27MasuyitePb(UO2)3O3(OH)2 · 3H2O
7.16.28VandendriesscheitePbU7O22 · 12H2O
7.16.29MetavandendriesscheitePbU7O22 · nH2O n < 12
7.16.30SayritePb2(UO2)5O6(OH)2 · 4H2O
7.16.31Wölsendorfite(Pb,Ca)U2O7 · 2H2O
7.16.32Clarkeite(Na,Ca,Pb)(UO2)O(OH) · 0-1H2O

Other Names for Billietite

Name in Other Languages:
Simplified Chinese:黄钡铀矿

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 Billietite

Reference List:
Vaes, J. F. (1947): Six nouveaux minéraux d'urane provenant de Shinkolobwe (Katanga). Annales de la Société Géologique Belge 70, B212-B229, esp. B214-B217 (in French). - Mineralogical Abstracts (1947), 10, 146 (abstract). - American Mineralogist (1948), 33, 384 (abstract).

Frondel, J. W. and Cuttitta, F. (1953): Studies of uranium minerals (XII): the status of billietite and becquerelite. American Mineralogist 38, 1019-1024.

Frondel, C. (1958): Systematic mineralogy of uranium and thorium. U.S. Geol. Sur. Bull. 1064, 68-72.

Christ, C. L. and Clark, J. R. (1960): Crystal chemical studies of some uranyl oxide hydrates. American Mineralogist 45, 1026-1061.

Pagoaga, M. K., Appleman, D. E. and Stewart, J. M. (1987): Crystal structures and crystal chemistry of the uranyl oxide hydrates becquerelite, billietite, and protasite. American Mineralogist 72, 1230-1238.

Vochten, R. and van Haverbeeke, L. (1990): Transformation of schoepite into the uranyl oxide hydrates: becquerelite, billietite and wölsendorfite. Mineralogy and Petrology 43, 65-72.

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 56.

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 Billietite

The following Billietite specimens are currently listed for sale on

Localities for Billietite

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.
  • South Australia
    • Flinders Ranges
      • North Flinders Ranges
        • Arkaroola Region (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
  • Liaoning Province (Manchuria; Dongbei Region)
    • Benxi Prefecture
      • Nanfen District
Dahlkamp, F.J. (2009): Uranium Deposits of the World. Springer (Berlin, Heidelberg), pp. 31-156
Czech Republic
  • Bohemia (Böhmen; Boehmen)
    • Hradec Králové Region
      • Krkonoše Mtn (Riesengebirge)
        • Špindlerův Mlýn (Spindlermühle)
Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
    • Ústí Region
      • Krušné Hory Mts (Erzgebirge)
        • Dubí (Eichwald)
Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)]
  • Moravia (Mähren; Maehren)
    • Vysočina Region
      • Nové Město na Moravě
Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
Democratic Republic of Congo (Zaïre)
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Kolwezi District
        • Kamoto
B Thorne collection
Specimen in the collection of Brent Thorne
        • Kolwezi
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 56
      • Lubumbashi (Elizabethville)
      • Shinkolobwe
Mineralogical Record: 8: 390; Mineralogical Record: 9: 33; Mineralogical Record: 20: 278.
      • Swambo
  • Alsace
    • Haut-Rhin
      • Thur valley (Thann valley)
        • Kruth
Le Règne Minéral, Hors Série IV (1998)
  • Brittany
    • Côtes-d'Armor
Le Règne Minéral, Hors Série IV, 1998
      • Collinée
Le Règne Minéral, Hors Série IV, 1998
  • Burgundy
    • Nièvre
Le Règne Minéral, Hors Série IV, 1998
  • Languedoc-Roussillon
    • Hérault
      • Lodève
[Le Règne Minéral 1997, 13, p.5-18]; Bariand, P., Bachet, B., Brassy, C., Medenbach, O., Deliens, M., Vautier, R., & Piret, P. (1993) A New Uranium Mineral from the Talmessi Mine, Iran, and Rabejac, France. Mineral. Rec.: 24: 463-467
  • Limousin
    • Haute-Vienne
      • Compreignac
P Haas collection
      • Saint-Sylvestre
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 56
  • Rhône-Alpes
    • Haute-Savoie
      • Vallorcine
Meisser, N. (2012): La minéralogie de l'uranium dans le massif des Aiguilles Rouges. Matér. Géol. Suisse, Sér. géotech. 96, 183 p.
    • Loire
      • Saint-Just-en-Chevalet
        • Saint-Priest-la-Prugne
          • Les Bois-Noirs Mining Claim
Denis Vernet - personnal
  • Baden-Württemberg
    • Black Forest
      • Menzenschwand
Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
      • Schenkenzell
        • Wittichen
          • Böckelsbach valley
No reference listed
          • Burgfelsen
No reference listed
          • Heubach Valley
No reference listed
      • Wolfach
        • Oberwolfach
          • Rankach valley
KOLITSCH, U. (1997): Ianthinit und weitere Neufunde aus der Grube Clara im mittleren Schwarzwald. - Erzgräber 11 (2), 76-88; WALENTA, K. (1999): Neue Mineralfunde von der Grube Clara. 8. Folge, 1. Teil. Lapis 24 (11), 34-37.
  • Bavaria
    • Upper Palatinate
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 56
  • Rhineland-Palatinate
    • Bad Kreuznach
      • Niederhausen
        • Lemberg
N. Jb. Miner. Abh. 115, 1-30 (1971)
  • Saxony
    • Vogtland
      • Zobes-Bergen District
        • Bergen U deposit
          • Bergen
Schnorrer-Köhler, G. (1991): Mineralogische Notizen V. Aufschluss 42, 155-171.; Wittern: "Mineralfundorte in Deutschland", 2001
  • Sardinia
    • Cagliari Province
      • Capoterra
Ciriotti, M.E., Blaß, G. (2010): Pot-pourri 2009: Identificazioni UKiS AMI, Minerali italiani di interesse. Micro, 1/2010, 124-127
  • Trentino-Alto Adige (Trentino-Südtirol)
    • Trento Province
      • Giudicarie Valleys
        • Chiese Valley
          • Condino
Campostrini, I., Demartin, F., & Gramaccioli, C. M. (2006). Rio Giulis. Minerali secondari del giacimento uranifero presso Condino, Trento. Rivista Mineralogica Italiana, 30(3), 152-165.
        • Rendena Valley
          • Bocenago & Spiazzo
Campostrini I.(2013): Minerali secondari dei giacimenti uraniferi nelle Arenarie di Val Gardena del Trentino occidentale (Alpi Meridionali, Italia). Studi Trent. Sci. Nat., 93, pagg. 89-114.
  • Catalonia
    • Lleida (Lérida)
      • El Pallars Jussà
        • La Vall Fosca
          • La Torre de Cabdella (La Torre de Capdella)
            • Castell-estaó
Abella, J. y Viñals, J. (2009). Čejkaita, arsenuranilita, compreignacita, natrozippeita y otros minerales raros de uranio en el yacimiento «Mina Eureka», Castell-estaó, La Torre de Cabdella, Lleida, Catalunya. Revista de Minerales. (2009-2), 52-71
  • Dalsland
    • Bengtsfors
  • Wallis (Valais)
    • Anniviers Valley
      • Saint-Luc
Wulser P.A. et al. 2005, Eur. J. Mineral. 17, 933-942
    • Le Trient Valley
      • Les Marécottes
        • La Creusaz
          • SE crest of Mt. Luisin
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Verlag Wepf & Co. (Basel), p. 77
Meisser, N. (2012): La minéralogie de l'uranium dans le massif des Aiguilles Rouges. Matér. Géol. Suisse, Sér. géotech. 96, 183 p.
  • Pennsylvania
    • Carbon Co.
      • Jim Thorpe (Mauch Chunk)
Geyer, A.R., Smith, R.C. & Barnes, J.H. (1976) Mineral Collecting in Pennsylvania.
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 56
  • Utah
    • Emery Co.
      • San Rafael District (San Rafael Swell)
        • Delta
Min News 16:1 p1
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