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Bi4O4(UO2)(AsO4)2 · 2H2O
yellow, orange-yellow; ...
Adamantine, Greasy
For the type locality, Walpurgis vein, Weißer Hirsch Mine, Schneeberg, Saxony, Germany.
This page provides mineralogical data about Walpurgite.

Classification of Walpurgite

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

E : Uranyl phosphates and arsenates
A : UO2:RO4 = 1:2

5 : AXO4·xH2O

20 : Arsenates (also arsenates with phosphate, but without other anions)
6 : Arsenates of Bi

Physical Properties of Walpurgite

Adamantine, Greasy
Diaphaneity (Transparency):
Transparent, Translucent
yellow, orange-yellow; colourless to light yellow in transmitted light.
Hardness (Mohs):
On {010}, perfect.
6.69 g/cm3 (Calculated)

Optical Data of Walpurgite

Biaxial (-)
RI values:
nα = 1.871 - 1.910 nβ = 1.975 - 2.000 nγ = 2.005 - 2.060
Measured: 50° to 60°, Calculated: 54° to 74°
Max Birefringence:
δ = 0.134 - 0.150
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of Walpurgite

IMA Formula:
Bi4O4(UO2)(AsO4)2 · 2H2O
Elements listed in formula:

Crystallography of Walpurgite

Crystal System:
Cell Parameters:
a = 7.13 Å, b = 10.44 Å, c = 5.49 Å
α = 101.6°, β = 110.82°, γ = 88.28°
a:b:c = 0.683 : 1 : 0.526
Unit Cell Volume:
V 373.79 ų (Calculated from Unit Cell)
Crystals lath-like [001] and tabular {010} with an oblique termination. Occurs also as sub-parallel aggregates and radial groups.
Twin plane and composition surface {010}, common, the twinned aggregates pseudo-monoclinic (resembling gypsum).
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of Walpurgite

Associated Minerals at Type Locality:

Relationship of Walpurgite to other Species

Other Members of Group:
Orthowalpurgite(BiO)4(UO2)(AsO4)2 · 2H2O
Phosphowalpurgite(BiO)4(UO2)(PO4)2 · 2H2O
8.EA.05Orthowalpurgite(UO2)Bi4O4(AsO4)2 · 2H2O
8.EA.05Phosphowalpurgite(UO2)Bi4O4(PO4)2 · 2H2O
8.EA.10HallimonditePb2(UO2)(AsO4)2 · nH2O
8.EA.10ParsonsitePb2(UO2)(PO4)2 · 0-2H2O
8.EA.15UlrichiteCaCu(UO2)(PO4)2 · 4H2O
8.EA.20LakebogaiteNaCaFe23+H(UO2)2(PO4)4(OH)2 · 8H2O
20.6.5MixiteCu62+Bi(AsO4)3(OH)6 · 3H2O

Other Names for Walpurgite

Name in Other Languages:
Simplified Chinese:砷铋铀矿
Traditional Chinese:砷鈾鉍礦

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 Walpurgite

Reference List:
Weisbach, A. (1871): Vorläufige Mittheilung [Über Trögerit und Walpurgin].- Neues Jahrbuch für Mineralogie, Geologie und Paläontologie, 869-870.

Weisbach A. (1873): Neue Uranerze von Neustädtel bei Schneeberg.- Jahrbuch für das Berg- und Hüttenwesen im Königreiche Sachsen, Abhandlungen, 119-121.

Winkler (1873): Journal für praktische Chemie, Leipzig: 7: 6.

Zepharovich, V.R. von (1873): Mineralogisches Lexicon für das Kaiserthum Oesterreich. vol. 2: 341 (Cites Lindacker in Vogl (1857) relating to Waltherite).

Weisbach, A. (1877) Jahrbuch für das Berg- und Hüttenwesen im Königreiche Sachsen, Abhandlungen, 1.

Bertrand (1881) Bulletin de la Société française de Minéralogie: 4: 58 (as Waltherite).

Chester, A.H. (1896) A Dictionary of the Names of Minerals including Their History and Etymology, 320pp., New York: 285 (Waltherite).

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 155.

Frondel, C. (1943) American Mineralogist: 28: 521 (as Waltherite).

Fischer (1946) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 106: 25.

Fischer (1948) Neues Jahrbuch für Mineralogie, Monatshefte, Abt. A: 44.

Evans (1950) American Mineralogist: 35: 1021.

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. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 796-797.

Mereiter, K. (1982): The crystal structure of walpurgite, (UO2)Bi4O4(AsO4)2·2H2O. Tschermaks Mineralogische und Petrographische Mitteilungen: 30: 129-139.

American Mineralogist (1983): 68: 852.

European Journal of Mineralogy (1995): 7: 1313.

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 Walpurgite URL:
Please feel free to link to this page.
The following Walpurgite specimens are currently listed for sale on

Localities for Walpurgite

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.
(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.
Czech Republic
  • Bohemia (Böhmen; Boehmen)
    • Hradec Králové Region
      • Krkonoše Mtn (Riesengebirge)
        • Špindlerův Mlýn (Spindlermühle)
- Plášil J., Sejkora J., Plecháček J., Jebavá I., Škácha P., Škoda R., Fejfarová K.: Walpurgin z uranového ložiska Medvědín (Česká republika). Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 2011, 19, 2, 171-181.
    • Karlovy Vary Region
      • Krušné Hory Mts (Erzgebirge)
        • Jáchymov District (St Joachimsthal)
          • Jáchymov (St Joachimsthal)
Vogl (1857) Gangverhaltn. und Mineralreich, Joachimsthal, Teplitz: 169; Palache et al (1951), Dana's System of Mineralogiy, 7th. ed., Vol. 2: 262.
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: 797; Lapis (2002): (7/8), 54.
      • Mariánské Lázně (Marienbad)
        • Slavkovský Les Mtn
Sejkora, J., Cejka, J., Hlousek, J., Srein, V., Novotna, M. (2002): Phosphatian walpurgite from Smrkovec, the Slavonsky Les Mts. (Czech Republic): its description and physico-chemical characteristics. Neues Jahrb.Mineral, Mh., 2002, 353-367
    • Liberec Region
      • Harrachov (Harrachsdorf)
Bradna, J., Šita, F.: Nálezy minerál na Rýžovišti u Harrachova. Opera Corcontica, 1968, 5, s. 246-247.
      • Jablonec nad Nisou
Viktor Goliáš, Gereltsetseg Tumurkhuu, Pavel Kohn, Ondřej Šálek, Jakub Plášil, Radek Škoda, Jan Soumar (2016): Construction of new houses on a uranium vein outcrop: a case study from the Czech Republic. Nukleonika 61(3), 343-349.
  • Baden-Württemberg
    • Black Forest
      • Schenkenzell
        • Wittichen
Slotta, C. (2004): Orthowalpurgin und Walpurgin von der Grube Alt St. Josef zu Wittichen, Schwarzwald. Lapis 29 (3), 19-20.
          • Burgfelsen
No reference listed
          • Heubach Valley
No reference listed
K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
      • Schiltach
        • Stammelbach valley
[Lapis 1992, 11, p.13-20]
      • Triberg
        • Nußbach
No reference listed
      • Wolfach
        • Oberwolfach
          • Rankach valley
WALENTA, K. (1995): Neue Mineralfunde von der Grube Clara. 6. Folge, 2. Teil. - Lapis 20 (6), 41 und 46-49.
  • Saxony
    • Erzgebirge
      • Altenberg
Wittern: "Mineralfundorte in Deutschland", 2001
      • Breitenbrunn District
        • Antonsthal
Gröbner J., Kolitsch U.; Neufunde aus dem Erzgebirge (II), Mineralien-Welt Jg 17 (2006), 3, pag. 22-27.
      • Ehrenfriedersdorf
        • Geyer
Wittern: "Mineralfundorte in Deutschland", 2001
      • Eibenstock
        • Blauenthal
Tröger, S. (2009): Der Steinbruch Fahsel im Eibenstocker Granit, Westerzgebirge. Lapis 34 (6), 49-52.
      • Johanngeorgenstadt District
        • Johanngeorgenstadt
Gröbner, J., Grimm, O. & Zienau, H. (2005): Neufunde interessanter Wismut- und Uranmineralien am Schaarschacht, Johanngeorgenstadt, Sachsen. Lapis 30 (6), 44-51; 62.
      • Schneeberg District
        • Neustädtel
Lapis 30(7/8):41-70 (2005)
Lapis 30(7/8):41-70 (2005)
Lapis 30(7/8):41-70 (2005)
Lapis 30(7/8):41-70 (2005)
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: 793.
A. Weisbach (1871): Vorläufige Mittheilung [Über Trögerit und Walpurgin].- Neues Jahrbuch für Mineralogie, Geologie und Paläontologie, 869-870; 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: 797, 967, 991.
Schlegel, L., Kleeberg, R. & Meisser, N. (1996): Lapis 21(9), 37-41.
Lapis 30(7/8):41-70 (2005)
        • Wolfgang Maaßen Mine field
Lapis 30(7/8):41-70 (2005)
        • Zschorlau
Lapis 30(7/8):41-70 (2005)
    • Vogtland
      • Oelsnitz
Gröbner, J. and Kolitsch, U. (2007): The minerals of the uranium prospect at Tirpersdorf, Vogtland. Lapis 32, 37-42; 58. (in German)
Germany & Czech Republic
  • Erzgebirge; Krusné Hory Mts (Ore Mts)
Sejkora, J., Škoda, R., Škácha, P., Bureš, B. & Dvořák, Z. (2009): Nové mineralogické nálezy na Sn-W ložisku Cínovec v Krušných horách (Česká republika). Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze 17 (2), 23-30 (in Czech with English abstract).
  • Erongo Region
Bezing, L. von, Bode, R. & Jahn, S. (2008): Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, 321 pp. (in English)
    • Karibib District
Schnaitmann, E. A., Nägele, H., Niedermayr, G., Brandstätter, F. & Jahn, S. (2007): Das Metazeunerit-Pocket auf Tubussis 22, Erongo. Mineralien-Welt 18 (2), 33-43. (in German)
  • Lower Silesia (Dolnośląskie)
    • Jelenia Góra District
Mochnacka, K., Banaś, M. (2000): Occurrence and genetic relationships of uranium and thorium mineralization in the Karkonosze-Izera Block (The Sudety Mts, SW Poland). Annales Societatis Geologorum Poloniae: 70: 137-150
  • Viseu District
    • Viseu
Luis Martins collection
  • Wallis (Valais)
    • Le Trient Valley
      • Les Marécottes
- Meisser, N. (2012): La minéralogie de l'uranium dans le massif des Aiguilles Rouges. Matér. Géol. Suisse, Sér. géotech. 96, 183 p.
  • Scotland
    • Dumfries & Galloway
      • Dalbeattie
Livingstone, 2002, p. 186
      • Needle's Eye
BMS Database; R. S. W. Braithwaite and J. R. Knight (1990) Rare Minerals, Including Several New to Britain, in Supergene Alteration of U-Cu-As-Bi-Co Mineralisation Near Dalbeattie, South Scotland. Mineralogical Magazine 54:129-131.
  • California
    • Kern Co.
      • Kern River Uranium District
        • Miracle Hot Springs (Hobo Hot Springs)
Troxel, Bennie Wyatt & P.K. Morton (1962), Mines and mineral resources of Kern County, California: California Division Mines & Geology County Report 1, 370 pp.: 333; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 330.
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