Database of luminescent Minerals


Chemical Formula: (K,Na)(UO2)(SiO3OH) 1,5H2O

Familly: Silicates

Status: IMA-GP

Mineral for Display: No


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Dark Orange /Tawn Very weakAlways
Short Waves (254 nm):      Tawn Very weakAlways
Other colors LW:                         
Orangy yellow , Orange , Tawn , Greenish , Brownish Green ,
Other colors SW:          
Greenish , Brownish Green ,

Daylight Picture

BOLTWOODITE, Rössing Mine, Namibia;

Col. G.Barmarin; Photo: G. Barmarin

Long Waves Picture (365nm)

BOLTWOODITE, Rössing Mine, Namibia; UVLW

Col. G.Barmarin; Photo: G. Barmarin

Short Waves Pictures (254nm)

BOLTWOODITE, Rössing Mine, Namibia; UVSW

Col. G.Barmarin; Photo: G. Barmarin


Galerie de photos:


     To the gallery (3 images in the gallery)

Phosphorescence (in the common meaning of the term) seen by naked eye:

No phosphorescence seen by naked eye whatever the type of UV


Fluoresces dull yellowish-green to brown in both SW and LW UV

Main Activator(s) and spectrum:

Most Common Activator: (UO2)2+ (Uranyl ion) intrinsic

Peaks in the spectrum (nm):

470, 500, 520, 545, (555), 565-570 

large band around 578nm with events at 503, 521, 563 and 602nm 

485.1, 501.5, 521.2, 543.0, 567.4, and 591.4 nm (Thuro Arnold and Nils Baumann)

Col. G. Barmarin; Spectre: G. Barmarin

Comments on activators and spectra:

Gorobets: 18850 cm-1, 18050 cm-1;

fluorescence lifetimes of 382 and 2130 ns (bi-exponential)

Best Locality for luminescence(*):

(*)Data are not exhaustive and are limited to the most important localities for fluorescence

Bibliographical Reference for luminescence:

Luminescence Reference on internet:

Mineralogical Reference on internet:

Search on Internet:

  Search for images on 'Google Image'

  Search for documents in English on Google

  Search for documents in any languages on Google

  Search on Wikipédia


Note: While all due attention has been paid to the implementation of the database, it may contain errors and/or accidental omissions. By nature, the database will always be incomplete because science always evolves according to new analysis.
A request providing no result means only that no such reference exists in the database, but it does not mean that what you are looking for does not exist, just not to our knowledge. If you think you have found an error or omission, please let us know via the contact page being sure to cite the source of information.


Quick search by fluorescent mineral name: