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About PseudojohanniteHide

Cu3(OH)2[(UO2)4(SO4)2] · 12H2O
Specific Gravity:
Crystal System:
Member of:
For its similarity in appearance to Johannite.
Zippeite Group.
Compare also johannite.

A product of mine dump alterations.

Classification of PseudojohanniteHide

Approval Year:

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
E : Uranyl sulfates
C : With medium-sized and large cations

Physical Properties of PseudojohanniteHide

on (101)
4.31 g/cm3 (Measured)    4.38 g/cm3 (Calculated)

Chemical Properties of PseudojohanniteHide

Cu3(OH)2[(UO2)4(SO4)2] · 12H2O
IMA Formula:
Cu3(OH)2[(UO2)4O4(SO4)2] · 12H2O
Emperical Formula (of original material):

Crystallography of PseudojohanniteHide

Crystal System:
Cell Parameters:
a = 10.027 Å, b = 10.822 Å, c = 13.396 Å
α = 87.97°, β = 109.2°, γ = 90.89°
a:b:c = 0.927 : 1 : 1.238
Unit Cell V:
1371.9 ų

Geological EnvironmentHide

Geological Setting:
In parageneses formed through the interaction of acidic sulphate mine drainage waters with uraninite (e.g. Jáchymov, La Creusaz) or uranyl silicates (e.g. Musonoï)

Type Occurrence of PseudojohanniteHide

General Appearance of Type Material:
Aggregates consisting of irregularly shaped crystals measuring up to 25 μm in length
Place of Conservation of Type Material:
National Museum Prague, Czech Republic (P1p 1/2000) and at the Geological Museum of Lausanne, Switzerland (holotype from Jachymov). Geological Museum of Lausanne, Switzerland (Musonoï & La Creusaz samples).
Geological Setting of Type Material:
In a paragenesis formed through the interaction of acidic sulphate mine drainage waters with uraninite
Associated Minerals at Type Locality:

Synonyms of PseudojohanniteHide

Other Language Names for PseudojohanniteHide

Relationship of Pseudojohannite to other SpeciesHide

Member of:
Other Members of this group:
Ammoniozippeite(NH4)2[(UO2)2(SO4)O2] · H2OOrth.
CobaltzippeiteCo(UO2)2(SO4)O2 · 3.5H2OMon. 2/m : B2/m
MagnesiozippeiteMg(UO2)2(SO4)O2 · 3.5H2OMon. 2/m : B2/m
NatrozippeiteNa5(UO2)8(SO4)4O5(OH)3 · 12H2OMon. 2/m : P21/m
NickelzippeiteNi2(UO2)6(SO4)3(OH)10 · 16H2O Mon.
PlavnoiteK0.8Mn0.6[(UO2)2O2(SO4)] · 3.5H2OMon. 2/m : B2/m
Sejkoraite-(Y)Y2(UO2)8(SO4)4O6(OH)2 · 26H2OTric. 1 : P1
ZinczippeiteZn(UO2)2(SO4)O2 · 3.5H2OMon. 2/m : B2/m
ZippeiteK3(UO2)4(SO4)2O3(OH) · 3H2OMon. 2 : B2

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Pseudojohannite associated with JohanniteCu(UO2)2(SO4)2(OH)2 · 8H2O
1 photo of Pseudojohannite associated with NatrozippeiteNa5(UO2)8(SO4)4O5(OH)3 · 12H2O
1 photo of Pseudojohannite associated with BrochantiteCu4(SO4)(OH)6
1 photo of Pseudojohannite associated with Sejkoraite-(Y)Y2(UO2)8(SO4)4O6(OH)2 · 26H2O
1 photo of Pseudojohannite associated with CuprosklodowskiteCu(UO2)2(SiO3OH]2 · 6H2O
1 photo of Pseudojohannite associated with RabejaciteCa(UO2)4(SO4)2(OH)6 · 6H2O

Related Minerals - Nickel-Strunz GroupingHide

7.EC.AdolfpateraiteK(UO2)(SO4)(OH)(H2O)Mon. 2/m : P21/b
7.EC.05CobaltzippeiteCo(UO2)2(SO4)O2 · 3.5H2OMon. 2/m : B2/m
7.EC.05MagnesiozippeiteMg(UO2)2(SO4)O2 · 3.5H2OMon. 2/m : B2/m
7.EC.05NickelzippeiteNi2(UO2)6(SO4)3(OH)10 · 16H2O Mon.
7.EC.05NatrozippeiteNa5(UO2)8(SO4)4O5(OH)3 · 12H2OMon. 2/m : P21/m
7.EC.05ZinczippeiteZn(UO2)2(SO4)O2 · 3.5H2OMon. 2/m : B2/m
7.EC.05ZippeiteK3(UO2)4(SO4)2O3(OH) · 3H2OMon. 2 : B2
7.EC.10RabejaciteCa(UO2)4(SO4)2(OH)6 · 6H2OOrth.
7.EC.15MarécottiteMg3(UO2)8(SO4)4O6(OH)2 · 28H2OTric. 1 : P1
7.EC.15Sejkoraite-(Y)Y2(UO2)8(SO4)4O6(OH)2 · 26H2OTric. 1 : P1

Fluorescence of PseudojohanniteHide

Green (UV)

Other InformationHide

Health Risks:
Contains uranium. Should be handled with care. Do not lick or ingest. Store away from inhabited areas.

References for PseudojohanniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ondruš, P., Veselovský, F., Skála, R., Císařová, I., Hloušek, J., Frýda, J., Vavřín, I., Čejka, J., and Gabašová, A. (1997) New naturally occurring phases of secondary origin from Jáchymov (Joachimstal). Journal of the Czech Geological Society: 42: 7-107.
Ondruš, P., Veselovský, F., Gabašová, A., Hloušek, J., and Šrein, V. (2003) Supplement to secondary and rock-forming minerals of the Jachymov ore district. Journal of the Czech Geological Society: 48(3-4): 149-155.
Brugger, J., Wallwork, K.S., Meisser N., Pring, A., Ondruš, P., and Čejka, J. (2006) Pseudojohannite from Jáchymov, Musonoï, and La Creusaz: A new member of the zippeite-group. American Mineralogist: 91: 929-936.
Plášil, J., Fejfarová, K., Wallwork, K.S., Dušek, M., Škoda, R., Sejkora, J., Čejka, J., F. Veselovský, J. Hloušek, N. Meisser, J. Brugger (2012): Crystal structure of pseudojohannite, with a revised formula, Cu3(OH)2[(UO2)4O4(SO4)2](H2O)12. Am. Mineral. 97, 1796-1803.
Plášil, J. (2015): Crystal structure refinement of pseudojohannite, Cu3(OH)2[(UO2)4O4(SO4)2](H2O)12, from the type locality - Jachýmov, Czech Republic. Journal of Geosciences 60, 123-127.

Internet Links for PseudojohanniteHide

Localities for PseudojohanniteHide

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.
Czech Republic
  • Karlovy Vary Region
    • Karlovy Vary District
      • Jáchymov
Pavel Skacha specimen
Tvrdý, J. & Plášil, J. (2010): Jáchymov - Reiche Erzlagerstätte und Radonbad im böhmischen Westerzgebirge. Aufschluss 61, 277-292.
Brugger, J. et al (2006) American Mineralogist: 91: 929-936.
Plášil, J., Dušek, M., Novák, M., Čejka, J., Císařová, I., Škoda, R. (2011): Sejkoraite-(Y), a new member of the zippeite group containing trivalent cations from Jáchymov (St. Joachimsthal), Czech Republic: Description and crystal structure refinement. American Mineralogist, 96, 983-991. ; Jakub Plášil, Jiří Sejkora, Radek Škoda, Pavel Škácha (2014): The recent weathering of uraninite from the Červená vein, Jáchymov (Czech Republic): a fingerprint of the primary mineralization geochemistry onto the alteration association. Journal of Geosciences, 59, 223-253.
DR Congo
  • Lualaba
    • Kolwezi mining district
      • Kolwezi
Brugger, J. et al (2006) American Mineralogist: 91: 929-936.; Wilson, W. E. (2018) The Musonoi mine, Kolwezi District, Lualaba Province, Democratic Republic of the Congo. Mineralogical Record 49:236-304
  • Valais
    • Saint-Maurice
      • Salvan
        • Les Marécottes
J. Brugger et al.: Am. Min. 91:929-936 (2006)
  • Utah
    • San Juan Co.
      • Red Canyon
J. Plášil, A.R. Kampf, A.V. Kasatkin, J. Marty, R. Škoda, S. Silva, J. Čejka (2013): Meisserite, Na5(UO2)(SO4)3(SO3OH)(H2O), a new uranyl sulfate mineral from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine 77, 2975-2988
Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., and Čejka, J. (2018) Markeyite, a new calcium uranyl carbonate mineral from the Markey mine, San Juan County, Utah, USA. Mineralogical Magazine, 82, 1089-1100.
      • White Canyon
        • Deer Flat
Specimens available at the Southern California Micromount Symposium.
        • Fry Mesa
Jakub Plášil, Karla Fejfarová, Radek Škoda, Michal Dušek, Joe Marty and Jiří Čejka (2013): The crystal structure of magnesiozippeite, Mg[(UO2)2O2(SO4)](H2O)3.5, from East Saddle Mine, San Juan County, Utah (U.S.A.). Mineral. Petrol. 107, 211-219.
Plášil, J., Fejfarová, K., Wallwork, K.S., Dušek, M., Škoda, D., Sejkora, J., Čejka, J., Veselovský, F., Hloušek, J., Meisser, N., Brugger, J. (2012): Crystal structure of pseudojohannite, with a revised formula, Cu3(OH)2[(UO2)4O4(SO4)2](H2O)12. American Mineralogist, 97, 1796-1803.
Mineral and/or Locality  
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