Database of luminescent Minerals


ESPERITE


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

Luminescence:


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

Daylight Picture


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

Short Waves Pictures (254nm)


ESPERITE under UVSW,
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


Comments:


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:


  http://www.mindat.org/show.php?name=Esperite

  http://webmineral.com/data/Esperite.shtml

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