Chemical Formula: (Na,Ca)2Nb2O6(OH,F)
Familly: Oxides and hydroxides
Status: IMA-A (GP)
Crystal System: Isometric
Mineral for Display: No
|Long Waves (365nm): || Yellowish Green ||Short Waves (254 nm): || Yellowish Green |
Phosphorescence (in the common meaning of the term) seen by naked eye:
Main Activator(s) and spectrum:
Most Common Activator: (UO2)2+ (Uranyl ion) as impurities
Other activators: Sm3+ , Eu3+ , Dy3+ , Tb3+ , Nd3+ ,
Peaks in the spectrum (nm):
Dy3+ : 479, 577nm
Tb3+ : 546nm
Sm3+ : 601nm
Nd3+ : 806, 867, 876, 880 - 881, 891, 1060nm
Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.
To the spectrum gallery (1 spectra in the gallery)
Comments on activators and spectra:
Steady-state luminescence spectra of pyrochlore revealed emission of REE, such as trivalent Dy and Nd (Gorobets and Rogojine 2001).
Best Locality for luminescence(*):
(*)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 ,
- Luminescent Spectra of Minerals, Boris S. Gorobets and Alexandre A. Rogojine, Moscow, 2002 ,
Mineralogical Reference on internet:
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