Database of luminescent Minerals


Chemical Formula: CaMgSi2O6

Familly: Silicates


Crystal System: Monoclinic

Mineral for Display: No


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Blue Weak
Short Waves (254 nm):      Blue Strong
Other colors SW:               
Bluish White , Greenish Blue , sky-blue ,

Daylight Picture

DIOPSIDE, Stockton Mining District, Tooele, Utah, USA

Photo and Copyright: James Horste
Used with permission of the author.

Short Waves Pictures (254nm)

DIOPSIDE UVSW, Stockton Mining District, Tooele, Utah, USA

Photo and Copyright: James Horste
Used with permission of the author.


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

No Data


Variety fassaite : white SW and LW;(Fassaite is now associated with augite but sometime described a diopside variety in the 19th publication)
Associated as grain (fluo blue SW) in wernerite (fluo orange LW) in Canada.
Associated with NORBERGITE (fluo Yellow SW) in Franklin, New jersey, USA;

Main Activator(s) and spectrum:

Most Common Activator: n[TiO6] cluster

Other activators:            Cr3+ , Fe3+ , Mn2+ , Nd3+ ,

Peaks in the spectrum (nm):

[TiOn]m-: 450nm band, 520nm
Mn2+II repl. Ca2+: 580 - 585 - 586nm
Mn2+I repl. Mg2+: 690nm (Franklin, USA exc. 532nm)
Fe3+ : 758nm (Otter Lake, Canada, exc. 532nm)
Cr3+ repl. Mg2+?: 684, 705, 860nm
Cr3+broad band at 785nm  connected to Cr3+ center in weak crystal field (decay time of 5 μs) 
Cr3+ in average crystal field or to V2+ : broad structured band peaking at approximately 700 nm with peaks at 679, 685, 700, 722nm (V2+) (sample from Tyrol, exc. 532nm)
(?) : 670nm (sample from Fassathal, Tyrol, exc. 532nm)
Nd3+ : 874, 891, 916nm (Otter Lake, Canada, exc. 780nm)

No spectrum for the moment

Comments on activators and spectra:

Natural diopside displays a large variety of luminescence centers: at room temperature main features are a 450 nm band, that can be ascribed to the TiO6 complex, an intense bands at 585 and 690 nm that can be ascribed to Mn2+ ions in M2 (Ca2+) and M1 (Mg2+) sites, lines near 684 nm belonging to Cr3+ and band peaking at 690 nm ascribed to Fe3+ (Gorobets and Rogojine 2001).

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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