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Pseudojohannite

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Rovnost Mine (Werner Mine), Jáchymov (St Joachimsthal), Ostrov, Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
© Brent Thorne 2007

Show Pseudojohannite Photos (2)
Formula:
Cu
 
6.5
(UO
 
2
)
 
8
[O
 
8
|(OH)
 
5
|(SO
 
4
)
 
4
] · 25H
 
2
O
System:TriclinicColour:Moss-green
Name:For its similarity in appearance to Johannite.


Zippeite Group

A product of mine dump alterations.

Classification of Pseudojohannite

IMA status:Approved
Strunz 8th edition ID:6/D.21-40
Nickel-Strunz 10th (pending) edition ID:7.EC.20

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

Type Locality:Rovnost Mine (Werner Mine), Jáchymov (St Joachimsthal), Ostrov, Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
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:
UranopiliteUraniniteTennantitePyriteJohannite
GypsumChalcopyrite

Occurrences of Pseudojohannite

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)

Physical Properties of Pseudojohannite

Colour:Moss-green
Cleavage:Perfect
on (101)
Density (measured):4.31 g/cm3
Density (calculated):4.38 g/cm3

Crystallography of Pseudojohannite

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

Chemical Properties of Pseudojohannite

Formula:
Cu
 
6.5
(UO
 
2
)
 
8
[O
 
8
|(OH)
 
5
|(SO
 
4
)
 
4
] · 25H
 
2
O
All elements listed in formula:Cu, H, O, S, U
Analyical Data:Empirical sum formula calculated for a total of 70 oxygen atoms
Empirical Formula:
Cu
 
6.52
U
 
7.85
S
 
4.02
O
 
70
H
 
55.74
Relationship of Pseudojohannite to other Species
Related Minerals - Nickel-Strunz Grouping):

- + 
7.EC.05Cobaltzippeite
Co
 
2
(UO
 
2
)
 
6
(SO
 
4
)
 
3
(OH)
 
10
·16H
 
2
O
7.EC.05Magnesiozippeite
Mg(UO
 
2
)
 
2
(SO
 
4
)(OH)
 
4
·1.5H
 
2
O
7.EC.05Nickelzippeite
Ni
 
2
(UO
 
2
)
 
6
(SO
 
4
)
 
3
(OH)
 
10
·16H
 
2
O
7.EC.05Natrozippeite
Na
 
4
(UO
 
2
)
 
6
[(OH)
 
10
|(SO
 
4
)
 
3
] · 4H
 
2
O
7.EC.05Zinczippeite
Zn
 
2
(UO
 
2
)
 
6
(SO
 
4
)
 
3
(OH)
 
10
·16H
 
2
O
7.EC.05Zippeite
K
 
4
(UO
 
2
)
 
6
[(OH)
 
10
|(SO
 
4
)
 
3
] · 4H
 
2
O
7.EC.10Rabejacite
Ca(UO
 
2
)
 
4
(SO
 
4
)
 
2
(OH)
 
6
 · 6H
 
2
O
7.EC.15Marécottite
(H
 
3
O)
 
8
Mg
 
3
(UO
 
2
)
 
4
[O
 
3
|OH|(SO
 
4
)
 
2
]
 
2
 · 10H
 
2
O
Other Names for Pseudojohannite
Synonyms:
IMA2000-019
Other Languages:
German:Pseudojohannit
Other Information
Fluorescence in UV light:Green (UV)
Health Warning:Contains uranium. Should be handled with care. Do not lick or ingest. Store away from inhabited areas.
References for Pseudojohannite
Reference List: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.


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    Localities for Pseudojohannite
     		

    (TL) indicates type locality.  ? 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)
    

      • Karlovy Vary Region
    

        • Krušné Hory Mts (Erzgebirge)
    

          • Ostrov
    

            • Jáchymov (St Joachimsthal)
    
    		Brugger, J. et al (2006) American Mineralogist: 91: 929-936.
    Democratic Republic of Congo (Zaïre)
     
    

    • Katanga (Shaba)
    

      • Katanga Copper Crescent
    

        • Western area
    

          • Kolwezi
    
    		Brugger, J. et al (2006) American Mineralogist: 91: 929-936.
    Switzerland
     
    

    • Wallis (Valais)
    

      • Le Trient Valley
    

        • Les Marécottes
    
    		J. Brugger et al.: Am. Min. 91:929-936 (2006)
    

    


    

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