Where it forms, where it's found
- Geological setting
In a paragenesis formed through the interaction of acidic sulphate mine drainage waters with uraninite
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 locality
- Rovnost Mine
- Jáchymov
- Karlovy Vary District
- Karlovy Vary Region
- Czech Republic
50.3714°, 12.8935°
11recorded occurrences
Radioactivity
Physical
- Transparency
- Transparent · Translucent
- Colour
- Moss-green
- Tenacity
- brittle
- Cleavage
- Perfect
on (_101)
- Density
- 4.31 g/cm³
Optical
- Optical type
- Biaxial
- UV response
- Green (UV)
- Notes
n(min.) = 1.725 n(max.) = 1.740
Crystallography
- Space group
- P-1
- Cell parameters
- a = 8.6744(4) Å · b = 8.8692(4) Å · c = 10.0090(5) Å
- Cell angles
- α = 72.105(4) ° · β = 72.105(4) ° · γ = = 76.035(4) °
- Ratio a:b:c
- 1 : 1.022 : 1.154
- Unit cell volume
- 682.61 ų
- Z
- 1
- Type-locality form
Aggregates consisting of irregularly shaped crystals measuring up to 25 μm in length
- Comment
based on single-crystal X-ray diffraction study
Crystal structure
Chemical composition
Synonyms
- IMA2000-019
- Pseudojohanniet
- Unnamed (Cu-U Sulphate)
In other languages
- German
- IMA 2000-019 · Pseudojohannit
- Italian
- Pseudojohannite
Classification
Strunz
10th ed.7.EC.20
- 7SulfatesClass
- 7.EUranyl sulfatesDivision
- 7.ECWith medium-sized and large cationsGroup
- 7.EC.20PseudojohanniteSpecies
Group, growth & confusion
Ammoniozippeite(NH4)2[(UO2)2(SO4)O2] · H2OMineral—- CobaltzippeiteCo(UO2)2(SO4)O2 · 3.5H2OMineral—
MagnesiozippeiteMg(UO2)2(SO4)O2 · 3.5H2OMineral—
NatrozippeiteNa5(UO2)8(SO4)4O5(OH)3 · 12H2OMineral—- NickelzippeiteNi2(UO2)6(SO4)3(OH)10 · 16H2OMineral—
PlavnoiteK0.8Mn0.6[(UO2)2O2(SO4)] · 3.5H2OMineral—- Sejkoraite-(Y)Y2[(UO2)8O6(SO4)4(OH)2] · 26H2OMineral—
- ZinczippeiteZn(UO2)2(SO4)O2 · 3.5H2OMineral—
ZippeiteK2[(UO2)4(SO4)2O2(OH)2](H2O)4Mineral—
Literature, links & citation
Citations
- 1997Ondruš, P., Veselovský, F., Skála, R., Cisařová, I., Hloušek, J., Frýda, J., Vavřín, I., Čejka, J., Gabašová, A. (1997) New naturally occurring phases of secondary origin from Jáchymov (Joachimsthal) Journal of the Czech Geological Society, 42 (4) 77-108
- 2003Ondruš, P., Veselovský, F., Gabašová, A., Hloušek, J., Šrein, V. (2003) Supplement to secondary and rock-forming minerals of the Jáchymov ore district. Journal of the Czech Geological Society, 48 (3-4) 149-155
- 2006Brugger, J., Sheree Wallwork, Kia, Meisser, Nicolas, Pring, Allan, Ondrus, Petr, Čejka, Jiří (2006) Pseudojohannite from Jáchymov, Musonoi, and La Creusaz: A new member of the zippeite-group. American Mineralogist, 91 (5) 929-936 doi:10.2138/am.2006.1885 DOI: 10.2138/am.2006.1885
- 2009Frost, Ray L., Plášil, Jakub, Čejka, Jiří, Sejkora, Jiří, Keeffe, Eloise C., Bahfenne, Silmarilly (2009) Raman spectroscopic study of the uranyl mineral pseudojohannite Cu6.5[(UO2)4O4(SO4)2]2(OH)5·25H2O. Journal of Raman Spectroscopy, 40 (12) 1816-1821 doi:10.1002/jrs.2268DOI: 10.1002/jrs.2268
- 2012Plasil, J., Fejfarova, K., Wallwork, K. S., Dusek, M., Skoda, R., Sejkora, J., Cejka, J., Veselovsky, F., Hlousek, 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 (10) 1796-1803 doi:10.2138/am.2012.4127 DOI: 10.2138/am.2012.4127
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Pseudojohannite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/pseudojohannite-26289},
note = {Accessed 2026-05-11}
}