Database of luminescent Minerals


Chemical Formula:See CHRYSOBERYL

Familly: Oxides and hydroxides

Status: NON APPR

Crystal System: Orthorhombic

Mineral for Display: No


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Red Weak
Mid waves (320 nm):      Red
Short Waves (254 nm):      Red Weak
Other colors LW:     
Greenish white ,

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

No phosphorescence seen by naked eye whatever the type of UV


CHRYSOBERYL var. alexandrite

Main Activator(s) and spectrum:

Most Common Activator: Cr3+

Other activators:            Mn4+ , V2+ ,

Peaks in the spectrum (nm):

663, 664,

Cr3+ II : 679, 680nm 

Cr3+: 689, 690, 693, 694nm

Cr3+701, 707, 720, 721nm 

Broad band peaking at +/- 600 

V2+ (?) : broad band peaking at +/- 717nm 

Mn4+ : broad bands around 650 - 670nm 

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


  To the spectrum gallery (5 spectra in the gallery)

Comments on activators and spectra:

Two types of Cr3+ luminescence centers have been found in natural alexandrite, characterized at 300 K by R-lines at approximately 679.0 with 677.3 nm and 694.4 with 691.7 nm, accompanied by very many N-lines of Cr-Cr pairs.

Those centers have been identified as connected with substitutions of Al3+ in different structural sites (Tarashchan 1978).  (Scalvi et al. 2003; Trindade et al. 2011)

Best Locality for luminescence(*):

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

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