Database of luminescent Minerals


Chemical Formula: Al2Si2O5(OH)4 2H2O

Familly: Silicates

Status: IMA-A

Mineral for Display: No

Associated names (luminescent varieties, discredited names, synonymes etc.):  confolensitelithomarge


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Yellowish White
Short Waves (254 nm):      Greenish white
Other colors LW:                    
Bluish White , Pale Yellow , Greenish white , Yellowish ,
Other colors SW:                                        
Bluish White , Yellowish White , Pale Yellow , Greenish Yellow , Green , Greenish , Brownish Green , Yellowish ,

Daylight Picture

HALLOYSITE, Beez, Belgium ;
Col. G.Barmarin; Photo: G. Barmarin

Long Waves Picture (365nm)

HALLOYSITE, Beez, Belgium ; UVLW
Col. G.Barmarin; Photo: G. Barmarin

Short Waves Pictures (254nm)

HALLOYSITE, Beez, Belgium ; UVSW
Col. G.Barmarin; Photo: G. Barmarin


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

No Data

Main Activator(s) and spectrum:

Most Common Activator: (UO2)2+ (Uranyl ion) as impurities

Peaks in the spectrum (nm):

UO22+ : 499, 519, 542, 565nm

Halloysite, Beez (Namur), Belgium.
Excitation: Superbright 254nm. Col. G. Barmarin; Spectre: G. Barmarin

Comments on activators and spectra:

Typical spectrum of Uranyl Impurities

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:

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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.


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