Database of luminescent minerals 

NEPHELINE

Chemical formula: Na₃KAl₄Si₄O₁₆

Family: Silicates

Status: IMA-GP

Display mineral: NON

Associated names (luminescent varieties, discredited names, synonyms, etc.): eleolite, 

Luminescence:

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Phosphorescence (in the common sense of the term) observable with the naked eye:

No data

Comments:

Activator(s) and spectrum:

Activator(s): Fe³⁺, Cr³⁺,  

No spectrum yet

Comments on spectrum and activators:

Time resolved luminescence spectra under excitation by 266 nm are characterized by the band peaking at 695 nm with a decay time of 100 μs.

Principally it may be connected to Fe³⁺ or Cr³⁺ centers. (Gaft)

Best localities for fluorescence (*):

• Ilimaussaq complex, Kvanefjeld, Narsaq, Kitaa (West Greenland) Province, Greenland ;
• Jebel Bou-Agrao, Tamazeght Mountain Range, Khénifra Province, Meknès-Tafilalet Region, Morocco (weak yellowish SW and LW, could be an alteration or other mineral covering nepheline);
• Michelsberg Quarry, Katzenbuckel, Eberbach, Odenwald, Baden-Württemberg, Germany (white-blue LW);
• Ladjuar Medam, Sar-e Sang, Koksha Valley, Khash & Kuran Wa Munjan Districts, Badakhshan Province, Afghanistan (not really fluorescent but covering sodalite);

(*)The data are not exhaustive and are limited to a few remarkable localities for fluorescence

Bibliographic reference for luminescence:

• The Henkel Glossary of Fluorescent Minerals, Dr. Gerhard Henkel, Published by the FMS, 1989 ,
• The World of Fluorescent Minerals, Stuart Schneider, Schiffer Publishing, 2006, ISBN 0-7643-2544-2 ,
• 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 ,

Reference for luminescence on the Internet:

Mineralogical reference on the Internet:

  http://www.mindat.org/show.php?name=Nepheline

  http://webmineral.com/data/Nepheline.shtml

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