Database of luminescent Minerals


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


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


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:

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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.
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