Database of luminescent Minerals


Chemical Formula: CaAl2Si2O8

Familly: Silicates

Status: IMA-GP

Crystal System: Triclinic

Mineral for Display: No


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Yellowish White
Short Waves (254 nm):      White
Other colors SW:     
Red ,

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

No Data

Thermoluminescence: Yes

Main Activator(s) and spectrum:

Most Common Activator: Fe3+

Other activators:            Sm3+ , Eu3+ , Dy3+ , Nd3+ ,

Peaks in the spectrum (nm):

Fe3+ (?) : broad band at 700 or 728 or 752nm (exc. 532nm)

Eu3+ : 588, 611nm

No spectrum for the moment

Comments on activators and spectra:

Excitation by CW laser with 532 and 780 nm revealed several broad bands and narrow luminescence lines. Narrow lines peaking at 588 and 611 nm evidently belong to Eu3+ luminescence as in synthetic anorthite artificially activated by Eu (Yu et al. 2012). The most probable substitution is for one of the Ca2+ sites. Other narrow lines in visible and NIR spectral ranges may be connected with Dy3+, Sm3+and Nd3+.

Two broad emission bands evidently present peaking at 700 and 752 and often they present together resulting in emission with intermediate maximum (728nm). Those bands interpretation needs decay time study, but preliminary it may be supposed that they are connected to Fe3+ in tetrahedral coordination in Si and Al positions.

Al and Si atoms both occupy tetrahedral sites with 4 coordinated oxygen atoms, while one type of Ca2+ ion occupies an octahedral site with six oxygen atoms and other Ca2+ ions occupy three kinds of polyhedral sites with 7 coordinated oxygen atoms with different Ca-O bond distance. (Gaft)

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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