Database of luminescent Minerals


Chemical Formula: PbCa3Zn4(SiO4)4

Familly: Silicates

Status: IMA-A

Crystal System: Monoclinic

Mineral for Display: Yes

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


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Yellowish White Weak
Short Waves (254 nm):      Yellow Very StrongAlways

Daylight Picture

Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author

Short Waves Pictures (254nm)

Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author


Galerie de photos:


     To the gallery (3 images in the gallery)

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

No Data

Thermoluminescence: Yes


synonyme: calcium larsenite. Associated with willemite (green), hardystonite (dark-blue), calcite (red) and clinohédrite (orange), esperite from franklin give the most exciting combinaison of luminescent colors in one sample.

Main Activator(s) and spectrum:

Most Common Activator: Mn2+

Other activators:            Ce3+ , Sm3+ , Dy3+ ,

Peaks in the spectrum (nm):

Ce3+: 400nm
Mn2+ replacing Zn: narrow band peaking at 540-545nm
Sm3+ replacing Ca2+: small peaks at 600, 645nm
Dy3+ replacing Ca2+: 482, 575nm
Reabsorption at 580nm by Nd3+ and at 660nm by UO2+

Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.


  To the spectrum gallery (3 spectra in the gallery)

Comments on activators and spectra:

Activator: Mn2+ (6 coordinated) in Zn and Ca position accompanied by Ce3+,Dy3+ and Sm3+ lines (Gaft).
Decay time: 9 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:

Search on Internet:

  Search for images on 'Google Image'

  Search for documents in English on Google

  Search for documents in any languages on Google

  Search on Wikipédia


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.


Quick search by fluorescent mineral name: