Chemical Formula: BaNa2Al4Si4O16
Crystal System: Tetragonal
Mineral for Display: No
|Long Waves (365nm): || Yellowish Green ||Very often||Mid waves (320 nm): || Yellowish Green ||Very often||Short Waves (254 nm): || Bluish White ||Weak||Very often|
|Other colors SW: || |
Phosphorescence (in the common meaning of the term) seen by naked eye:
|Long Wave (365nm): ||Green ||Very often||Mid Waves (320 nm): ||Green ||Very often||Short Waves (254 nm): ||Green ||Very often|
Fluorescence Color similar to eucryptite for Wales UK specimens.
Main Activator(s) and spectrum:
Comments on activators and spectra:
Best Locality for luminescence(*):
- Benallt Mine (Tyddyn Meirion mine; Ty Canol mine), Rhiw, Llanfaelrhys, Lleyn Peninsula, Gwynedd, (Caernavonshire) Wales, UK (SW red)
- Langban, Varmland Province, Sweden (associated with cymrit SW green & Celsian SW blue);
(*)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 Reference on internet:
Mineralogical Reference on internet:
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