Database of luminescent minerals 

JOHANNITE

DOUBTFUL FLUORESCENCE but sometimes cited in luminescence literature

Chemical formula: Cu(UO₂)₂(SO₄)₂(OH)₂ 8H₂O

Family: Sulfates

Status: IMA-GP

Crystal system : Triclinic

Display mineral: NON

Luminescence:

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Phosphorescence (in the common sense of the term) observable with the 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.

Activator(s) and spectrum:

Activator(s): (UO₂)²⁺ (ion Uranyle) intrinsèque ,

Peaks in the spectrum (nm):

501.3, 525.8, 548.5, 578.0 +/-3nm

Source: Frankland, V.L., Milodowski, A.E., Read, D., Laser-Based Characterisation of the Copper Uranyl Sulphate, Johannite, Minerals 2022, 12, 1419. https:// doi.org/10.3390/min12111419

Best localities for fluorescence (*):

• Svornost Mine, Jáchymov, Jáchymov District, Krušné Hory Mts, Karlovy Vary Region, Bohemia, Czech Republic;

(*)The data are not exhaustive and are limited to a few remarkable localities for fluorescence

Bibliographic reference for luminescence:

• The Henkel Glossary of Fluorescent Minerals, Dr. Gerhard Henkel, Published by the FMS, 1989 ,

Reference for luminescence on the Internet:

Mineralogical reference on the Internet:

  http://www.mindat.org/show.php?name=Johannite

  http://webmineral.com/data/Johannite.shtml

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