SPINELLE
Chemical Formula: MgAl2O4
Familly: Oxides and hydroxides
Status: IMA-GP
Crystal System: Isometric
Mineral for Display: Yes
Luminescence:
UV Type |
Main color |
Intensity |
Observation Frequency |
|
| | | |
Long Waves (365nm): | Red | | | Mid waves (320 nm): | Red | | | Short Waves (254 nm): | Red | | | | | | |
Daylight Picture
Spinelle, Mogok, Burma;
Photo et col.: G. Barmarin
Long Waves Picture (365nm)
Spinelle, Mogok, Burma; Red UVLW
Photo et col.: G. Barmarin
Galerie de photos:
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To the gallery (10 images in the gallery)
Phosphorescence (in the common meaning of the term) seen by naked eye:
No phosphorescence seen by naked eye whatever the type of UVThermoluminescence: Yes
Main Activator(s) and spectrum:
Most Common Activator: Cr3+
Other activators: Mn2+ ,
Peaks in the spectrum (nm):
Cr3+ : lines at 676 (675), 686 (685), 698 (697), 708 (707), 712, 718 (717) nm
Mn2+ : broad band peaking at 550-612 nm
Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.
...
To the spectrum gallery (2 spectra in the gallery)
Comments on activators and spectra:
Activator: Cr3+ and possibly Mn2+ (broad band peaking at 612 nm or emissions bands with max from 550 to 620nm).
The fluorescence of spinel was studied as early as 1887 by De Boisbaudran who found a red glow in most specimens and some green fluorescence in a few.
Crookes plotted in 1887 the red fluorescence spectra of spinel and pointed out the particular sharp band at 685,7nm.
Nichols studied the cathodoluminescence of spinel in 1928.
Best Locality for luminescence(*):
- Mogok, Burma;
- An Phu, Lục Yên District, Yên Bái Province, Vietnam;
(*)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 ,
- Luminescenza nel regno minerale, Guido Mazzoleni, fotografia Roberto Appiani, Libri Sandit, 2010, ISBN 978-88-95990-63-7 ,
- Handbook of Fluorescent Gems and Minerals, a practical guide for the gem and mineral collector, Jack de Ment, 1949 ,
Luminescence Reference on internet:
Mineralogical Reference on internet:
http://www.mindat.org/show.php?name=Spinelle
http://webmineral.com/data/Spinelle.shtml
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