Database of luminescent Minerals


Chemical Formula: MgAl2O4

Familly: Oxides and hydroxides

Status: IMA-GP

Crystal System: Isometric

Mineral for Display: Yes


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Red
Mid waves (320 nm):      Red
Short Waves (254 nm):      Red

Daylight Picture

Spinelle, Mogok, Burma;
Photo et col.: G. Barmarin

Long Waves Picture (365nm)

Spinelle, Mogok, Burma; Red UVLW
Photo et col.: G. Barmarin


Galerie de photos:


     To the gallery (10 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

Thermoluminescence: Yes

Main Activator(s) and spectrum:

Most Common Activator: Cr3+

Other activators:            Mn2+ ,

Peaks in the spectrum (nm):

Cr3+ : lines at 676 (675), 686 (685), 698 (697), 708 (707), 712, 718 (717) nm
Mn2+ : broad band peaking at 550-612 nm 

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


  To the spectrum gallery (2 spectra in the gallery)

Comments on activators and spectra:

Activator: Cr3+ and possibly Mn2+ (broad band peaking at 612 nm or emissions bands with max from 550 to 620nm).

The fluorescence of spinel was studied as early as 1887 by De Boisbaudran who found a red glow in most specimens and some green fluorescence in a few.

Crookes plotted in 1887 the red fluorescence spectra of spinel and pointed out the particular sharp band at 685,7nm.

Nichols studied the cathodoluminescence of spinel in 1928.



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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