Chemical Formula: Ca14Nb2(Si2O7)4(O6,F2)
Crystal System: Monoclinic
Mineral for Display: No
|Long Waves (365nm): || Not fluorescent ||Short Waves (254 nm): || Orange Red |
Phosphorescence (in the common meaning of the term) seen by naked eye:
The Niocalite crystals are colour zoned in SW UV. The core of the crystals are a bright red colour and the surface of the crystals are a medium yellow-orange colour in SW UV. The Calcite response is the same as the core of the Niocalite crystals. There is no response in LW UV. (Richard Gunther on Mindat)
Main Activator(s) and spectrum:
Best Locality for luminescence(*):
- Bond zone, Oka complex, Oka, Deux-Montagnes RCM, Laurentides, Québec, Canada;
(*)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 Reference on internet:
Mineralogical Reference on internet:
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