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 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:
...To the gallery (3 images in the gallery)
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.
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)
Activator: Mn2+ (6 coordinated) in Zn and Ca position accompanied by Ce3+,Dy3+ and Sm3+ lines (Gaft).
Decay time: 9 ms
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
http://www.mindat.org/show.php?name=Esperite
http://webmineral.com/data/Esperite.shtml
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