Database of luminescent Minerals


Chemical Formula: Al2SiO5

Familly: Silicates

Status: IMA-GP

Crystal System: Triclinic

Mineral for Display: No

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


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Red Very weakOften
Mid waves (320 nm):      Red Very weak
Short Waves (254 nm):      Red Very weak
Other colors LW:                         
Yellowish White , Pale Yellow , Orange , Greenish white , Yellowish ,
Other colors MW:               
Bluish White , Yellowish White , Greenish white ,
Other colors SW:               
Bluish White , Yellowish White , Greenish white ,

Daylight Picture

Cyanite (Disthene), Russia.
Col. G. Barmarin; Spectre: G. Barmarin

Long Waves Picture (365nm)

Cyanite (Disthene)(Excitation: laser 405nm), Russia.
Col. G. Barmarin; Spectre: G. Barmarin


Galerie de photos:


     To the gallery (2 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

Main Activator(s) and spectrum:

Most Common Activator: Cr3+

Other activators:            TiO6 ,

Peaks in the spectrum (nm):

Cr3+ replacing Al (site A giving Doublet R-lines) : Lines at 688 or 689 and at 706nm  

Cr3+ (site B weak crystal field) : broad band peaking at 750nm

Cr3+ (site C weak crystal field) : broad band peaking at 780-790nm (Gaft)

TiO6 : very large band at 500-570nm  (Gorobets)

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


  To the spectrum gallery (4 spectra in the gallery)

Comments on activators and spectra:

Kyanite has four inequivalent Al3+ sites, which may be substituted by Cr3+.


Red luminescence reported to Cr3+ replacing aluminium (Tarashchan in Gaft) but three different site for Cr3+ identified.


The study of Cr3+ luminescence in kyanite has long history. 

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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