Chemical Formula: AlO(OH)
Familly: Oxides and hydroxides
Crystal System: Orthorhombic
Mineral for Display: No
|Short Waves (254 nm): || Yellowish White |
|Other colors LW: || |
Phosphorescence (in the common meaning of the term) seen by naked eye:
Main Activator(s) and spectrum:
Most Common Activator: Cr3+
Peaks in the spectrum (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:
Laser induced luminescence shows lines for Cr3+ at 692 and 694 nm, typical of 2E→4A2 transitions of Cr3+ luminescence centers (R-lines) substituting for Al3+ in six-fold coordination.
Yellow luminescence activator not known
Best Locality for luminescence(*):
- Chester, Massachusets, USA (SW, pâle yellow);
(*)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 ,
- Luminescence Spectroscopy of Minerals and Materials, M. Gaft, R. Reisfeld, G. Panczer, Springer Editor, ISBN: 10 3-540-21918-8 ,
- 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:
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