PREHNITE
Chemical Formula: Ca2Al2Si3O10(OH)2
Familly: Silicates
Status: IMA-GP
Crystal System: Orthorhombic
Mineral for Display: No
Luminescence:
UV Type |
Main color |
Intensity |
Observation Frequency |
|
| | | |
Long Waves (365nm): | Yellowish White | | | Mid waves (320 nm): | Pale Yellow | | | Short Waves (254 nm): | Bluish White | | | | | | |
Other colors LW: | Orange , |
Other colors SW: | White , Yellowish White , Pale Yellow , Orange , |
Daylight Picture
Prehnite, Jeffrey Mine, Asbestos, Québec, Canada;
Col. G. Barmarin; Photo: G. Barmarin
Long Waves Picture (365nm)
Prehnite UVLW, Jeffrey Mine, Asbestos, Québec, Canada;
Col. G. Barmarin; Photo: G. Barmarin
Short Waves Pictures (254nm)
Prehnite UVSW, Jeffrey Mine, Asbestos, Québec, Canada;
Col. G. Barmarin; Photo: G. Barmarin
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
Main Activator(s) and spectrum:
Most Common Activator: Pb2+
Peaks in the spectrum (nm):
Pb2+ : 356nm (exc. 266nm, t = 300ns)
Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.
Comments on activators and spectra:
Jeffrey Mine: bluish fluorescence under long wave UV illumination, plus orange-fluorescing coating by an unknown mineral (see picture above)
Best Locality for luminescence(*):
- Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA;
- Jeffrey Quarry, Asbestos, Shipton Township, Richmond Co., Québec, Canada;
- Jeffrey Mine, Asbestos, Les Sources RCM, Estrie, Québec, Canada;
- Ilimaussaq complex, Kvanefjeld, Narsaq, Kitaa (West Greenland) Province, Greenland;
- Taza, Taza Province, Taza-Al Hoceïma-Taounate Region, Morocco (dull luminescence SW+LW);
- Near Langban, Sweden (SW White);
(*)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 ,
Luminescence Reference on internet:
- Der Aufschluss, Vol.48, n°2 March/April 1997 Langban minerals by Fritz Blatter;
Images:
Mineralogical Reference on internet:
http://www.mindat.org/show.php?name=Prehnite
http://webmineral.com/data/Prehnite.shtml
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