Database of luminescent Minerals


GROSSULAR


Chemical Formula: Ca3Al2(SiO4)3

Familly: Silicates

Status: IMA-GP

Crystal System: Isometric

Mineral for Display: No

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

Luminescence:


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Red Weak
Mid waves (320 nm):      Red Weak
Short Waves (254 nm):      Red Extremely weak
Other colors LW:               
Violet red , Pink , Salmon pink ,
Other colors MW:     
Violet red ,
Other colors SW:          
Orange , Dark Orange /Tawn ,

Daylight Picture


GROSSULAIRE Lake Jaco, Chihuahua Mexico;
Col. G.Barmarin; Photo: G. Barmarin

Long Waves Picture (365nm)


GROSSULAIRE Lake Jaco, Chihuahua Mexico;   UVLW
Col. G.Barmarin; Photo: G. Barmarin

Short Waves Pictures (254nm)


GROSSULAIRE Lake Jaco, Chihuahua Mexico;   UVSW
Col. G.Barmarin; Photo: G. Barmarin

 

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


Comments:


Grossular garnet from Lake Jaco, Chihuahua Mexico, may be found as dark cherry red crystals, with vesuvianite. Under either MW or a filtered high pressure UV source, these garnets fluoresce brilliantly in a pure red.


Main Activator(s) and spectrum:


Most Common Activator: Cr3+

Other activators:            Mn2+ , V2+ ,

Peaks in the spectrum (nm):

Broad band peaking at 611nm, peak at 489nm and 713nm (échantillon en collection) 
Cr3+ : Lines at 690, 694, 698 and 707nm
Mn2+ substituting to Ca2+ : band around 590 nm
V2+ : peak at 717 nm  (Gaft)


Col. G.Barmarin; Photo: G. Barmarin

   ...

  To the spectrum gallery (1 spectra in the gallery)


Comments on activators and spectra:


The color is identical to that of red-fluorescing ruby corundum or spinel. As with those minerals, chromium in place of aluminium is the likely activator. Other activator: V2+ (717 nm), Nd3+ (462, 476, 482,501 nm) and possibly Mn2+ band around 605-610 nm (decay time: several ms).


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=Grossular

  http://webmineral.com/data/Grossular.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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