Database of luminescent Minerals


LAZURITE


Chemical Formula: Na6Ca2Al6Si6O24[(SO4),S,Cl,(OH)]2

Familly: Silicates

Status: IMA-GP

Crystal System: Isometric

Mineral for Display: No


Luminescence:


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Yellowish White
Short Waves (254 nm):      Orange Medium
Other colors LW:     
Bluish ,
Other colors SW:     
Bluish ,
 

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


UV Type Color Intensity Observation Frequency
Long Wave (365nm): Yellowish White Very weak
 

Thermoluminescence: Yes


Comments:


This is a mineral of the sodalite family, more precisely a sulfide rich variety of Hauyne.

 

Lazurite is the blue component of the Lapis Lazuli, which is a Lazurite-Calcite-Pyrite rock.

 

From Lyadjvar, Pamir mountains, Tadjikistan. Fluoresces bluish under LW.

 

Lazurite of Ovalle Chile said to be thermoluminescente and phosphorescente by De Ment (associated calcite?) (see bibliography)

 


Main Activator(s) and spectrum:


Most Common Activator: S2-

Other activators:            Fe3+ , Mn2+ , Nd3+ ,

No spectrum for the moment

Comments on activators and spectra:


Emission of S2- centers with vibrational structure even at room temperature was identified by Tarashchan (1978).

In his study of S2- Gaft revealed that this center has very fast decay of approximately 200–500 ns enabling to quench it by relatively small delay time and to detect other previously hidden luminescence centers. This approach revealed, besides S2- emission two broad bands not definitely identified yet, but the last one evidently belongs to Mn2+ based on its spectral position and form and long decay time. Excitation by CW laser at 532 and 780 nm revealed evidently luminescence of Nd3+, Fe3+, Mn2+ (broad band at 575nm) and S2- (broad band  at 620nm with weak vibrational structure) centers.

 


Best Locality for luminescence(*):


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


Bibliographical Reference for luminescence:



Mineralogical Reference on internet:


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

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

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