Database of luminescent Minerals


Chemical Formula: BeAl2O4

Familly: Oxides and hydroxides

Status: IMA-GP

Crystal System: Orthorhombic

Mineral for Display: No

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


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Red Very weak
Short Waves (254 nm):      Red Very weak
Other colors SW:     
Greenish Yellow ,

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

No Data


Varété alexandrite: fluorescence rouge due au chrome (Cr2+)
Chrysobéryl classique: jaune vert, crème, verdâtre;

Main Activator(s) and spectrum:

Most Common Activator: Cr3+

Other activators:            V2+ ,

Peaks in the spectrum (nm):

Cr3+ replacing Al  : 678, 680 nm 

TiO6 (?) : band at 540 nm (Gorobets), 

V2+ : band around 720 nm (80nm half-width)  (Gaft), 

689, 698, 703nm (Gaft)

Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.

Comments on activators and spectra:

Cathodoluminescence: red;

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:

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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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