Database of luminescent Minerals


BENITOITE


Chemical Formula: BaTiSi3O9

Familly: Silicates

Status: IMA-GP

Crystal System: Triclinic

Mineral for Display: Yes


Luminescence:


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Red WeakRarely
Short Waves (254 nm):      Bluish White Very StrongAllways

Daylight Picture


BENITOITE;
Photo and Copyright: G. Barmarin

Long Waves Picture (365nm)


BENITOITE, UVLW ;
Photo and Copyright: G. Barmarin

Short Waves Pictures (254nm)


BENITOITE, UVSW ;
Photo and Copyright: G. Barmarin

 

Galerie de photos:

            ...

     To the gallery (20 images in the gallery)


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


UV Type Color Intensity Observation Frequency
Long Wave (365nm): None by naked eye
Short Waves (254 nm): None by naked eye
 

Main Activator(s) and spectrum:


Most Common Activator: TiO6

Other activators:            Cr3+ , Fe3+ , Ti3+ , Ti4+ , Cu+ , Mn4+ , Ti - O ,

Peaks in the spectrum (nm):

TiO6 : 419nm
Ti3+ : broad band around 650-660nm with half-width of +/-135nm 
Cr3+ : 680nm
Mn4+ : 720nm
Cu+? replacing Ba2+ and Ti3+ (exc 337nm:(Gorobets)): 720nm
450nm (exc254nm)


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:


Robbins cites Fe as activator for the red color and Ti for the blue; recent spectrographic studies give new data:
There are three broadbands:
- one around 419 nm (blue band) is connected with intrinsic luminescence centers, namely isolated TiO6 octahedra,
- one at 650 nm (Yellow band) for Ti3+ ,
- one at 720 (half-width 125nm) for Mn4+
and a narrow line at 680 for Cr3+.(Gaft)
Manganese participation is supported by chemical analysis of benitoite (0.03 to 0.11%).
The metastable level 3T1u is the emitting level at low temperatures with a long decay time of 1.1 ms. At higher temperatures an energy level with higher radiation probability must be involved in the emission process, and this level is situated at 0.06 eV higher than the lowest level. These two levels may be connected with 3T1u level splitting or with closely spaced 3T1u and 3T2u levels. Decay time shortening and thermal quenching are connected with nonradiative decay within the TiO6 luminescence center, while energy migration does not take place at least up to room temperature.
(Source: M. Gaft, L. Nagli, G. Waychunas and D. Weiss, The nature of blue luminescence from natural benitoite, Physics and Chemistry of Minerals, vol31, 2004)
The red emission of benitoite consists of two individual bands and one line and suggest that the activators of luminescence in benitoite system are Ti3+ and a d3 element, namely Cr3+ or Mn4+.
(Source: M. Gaft, L. Nagli, G. Waychunas and G. Panczer, The nature of red luminescence of natural benitoite, Mineralogy and Petrology, Vol85, 2005)


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:


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

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

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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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