Chemical Formula: Na8-xNb4(Si4O12)2(O,OH)4 8H2O
Mineral for Display: No
|Long Waves (365nm): || Green ||Weak||Mid waves (320 nm): || Green ||Medium||Short Waves (254 nm): || Green ||Weak|
|Other colors LW: || |
|Other colors MW: || |
|Other colors SW: || |
Phosphorescence (in the common meaning of the term) seen by naked eye:
White coating on the pinacoidal faces of the nenadkevichite from Mont St Hilaire fluoresces sometime green under SW, MW and LW.
Main Activator(s) and spectrum:
Best Locality for luminescence(*):
- Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada;
- Ilimaussaq complex, Kvanefjeld, Narsaq, Kitaa (West Greenland) Province, Greenland;
(*)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 Reference on internet:
Mineralogical Reference on internet:
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