Chemical Formula: (Ce,La,Nd,Th)PO4
Familly: Phosphates, Arseniates, Vanadates
Crystal System: Monoclinic
Mineral for Display: No
|Short Waves (254 nm): || Orange |
|Other colors SW: || |
Phosphorescence (in the common meaning of the term) seen by naked eye:
exact type not specified: Monazite(Ce) or Monazite(La) or Monazite(Nd).
Main Activator(s) and spectrum:
Most Common Activator: (UO2)2+ (Uranyl ion) as impurities
Other activators: Sm3+ , Eu3+ , Nd3+ ,
Peaks in the spectrum (nm):
(UO2)2+ : 506, 523 nm
Laser induced luminescence lines corresponding to Sm3+, Eu3+, Nd3+:
Sm3+ : lines at 607, 617, 642nm
Nd3+ : weak lines at 792, 800, 806, strong lines at 863, 872, 877, 887, 897, 907nm
Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.
Best Locality for luminescence(*):
- Berg, Råde, Østfold, Norway (red-orange phosphorescence, De Ment, 1949);
- Montgomery Co., NC, USA (fluo light green) (Bernstein, Am. Mineral. 67, 356-359 (1982))
(*)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 ,
- Handbook of Fluorescent Gems and Minerals, a practical guide for the gem and mineral collector, Jack de Ment, 1949 ,
Mineralogical Reference on internet:
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