Database of luminescent Minerals
JOHANNITE
DOUBTFULL FLUORESCENCE but cited by some authors
Chemical Formula: Cu(UO2)2(SO4)2(OH)2 8H2O
Familly: Sulfates
Status: IMA-GP
Crystal System: Triclinic
Mineral for Display: No
Luminescence:
| UV Type | Main color | Intensity | Observation Frequency |
|---|---|---|---|
| Long Waves (365nm): | Green | Weak | Short Waves (254 nm): | Green | Very weak |
Phosphorescence (in the common meaning of the term) seen by naked eye:
No Data
Comments:
Despite the presence of Cu, johannite seems to have a faint green fluorescence, but like for many microscopic uranium minerals not allways very well crystallized, it is difficult to be sure of the determination. Samples from Jakymov associated with yellow magnesiozippeite or zippeite, but of a different greenish color have a faint green fluorescence SW and LW.
Main Activator(s) and spectrum:
Most Common Activator: (UO2)2+ (Uranyl ion) intrinsic
No spectrum for the momentBest Locality for luminescence(*):
- Svornost Mine, Jáchymov, Jáchymov District, Krušné Hory Mts, Karlovy Vary Region, Bohemia, Czech Republic;
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
Bibliographical Reference for luminescence:
- The Henkel Glossary of Fluorescent Minerals, Dr. Gerhard Henkel, Published by the FMS, 1989 ,
Mineralogical Reference on internet:
http://www.mindat.org/show.php?name=Johannite
http://webmineral.com/data/Johannite.shtml
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