DATOLITE
Chemical Formula: Ca2B2Si2O8(OH)2
Familly: Silicates
Status: IMA-GP
Crystal System: Monoclinic
Mineral for Display: No
Luminescence:
UV Type |
Main color |
Intensity |
Observation Frequency |
|
| | | |
Long Waves (365nm): | Yellowish White | | | Mid waves (320 nm): | Yellowish White | | | Short Waves (254 nm): | Pale Yellow | | | | | | |
Other colors LW: | Yellow , Tawn , |
Other colors MW: | Yellowish White , |
Other colors SW: | Pale Yellow , Yellow , |
Phosphorescence (in the common meaning of the term) seen by naked eye:
No Data
Main Activator(s) and spectrum:
Most Common Activator: Eu2+
Other activators: Ce3+ , Eu3+ , Mn2+ , Yb2+ ,
Peaks in the spectrum (nm):
Ce3+: 335, 350, 360, 370nm
Eu2+: 430, 445, 455nm
Yb2+: 520nm
Mn2+: 565nm
Eu3+: 577, 598, 510, 616 - 617, 700nm
(All repl. Ca2+)
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:
Luminescence centers Eu2+, Yb2+ and Mn2+, characterize steady-state spectra of datolite (Gaft et al. 1979). By using laser-induced time-resolved spectroscopy Gaft and al. were able to detect the following emission centers: Mn2+, Ce3+, Eu2+, Eu3+, Sm3+, Dy3+
Best Locality for luminescence(*):
- Paterson, Passaic Co., New Jersey, USA;
- Ca de Giannasi, Frassinoro, Modena Province, Emilia-Romagna, Italy;
- Mendicino County, California, USA (SW+LW bright lemon yellow);
- Skaggs Springs, Warm Springs Dam, Coast Range, Sonoma Co., California, USA;
- Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada;
(*)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 ,
- 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 ,
Luminescence Reference on internet:
- MONT-SAINT-HILAIRE, History, Geology, Mineralogy, Laszlo HORVATH, The Canadian Mineralogist, Special Publication 14, 2019
Mineralogical Reference on internet:
http://www.mindat.org/show.php?name=Datolite
http://webmineral.com/data/Datolite.shtml
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