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 Strong | Always | | | | |
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:

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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.

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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(*):
- Franklin, New Jersey, USA;
- El Dragón mine, Antonio Quijarro Province, Potosí Department, Bolivia (microcrystals);
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
Bibliographical Reference for luminescence:
- The Henkel Glossary of Fluorescent Minerals, Dr. Gerhard Henkel, Published by the FMS, 1989 ,
- Fluorescence: Gems and Minerals Under Ultraviolet Light, Manuel Robbins, 1994, Geoscience Press, ISBN 0-945005-13-X ,
- The World of Fluorescent Minerals, Stuart Schneider, Schiffer Publishing, 2006, ISBN 0-7643-2544-2 ,
- Luminescence Spectroscopy of Minerals and Materials, M. Gaft, R. Reisfeld, G. Panczer, Springer Editor, ISBN: 10 3-540-21918-8 ,
- Luminescent Spectra of Minerals, Boris S. Gorobets and Alexandre A. Rogojine, Moscow, 2002 ,
- Ultraviolet Light and Fluorescent Minerals, Th. Warren, S. Gleason, R. Bostwick, et E. Verbeek, 1995, ISBN 0-9635098-0-2 ,
- Franklin Website: http://franklin-sterlinghill.com ,
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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