Chemical Formula: CaAl2XAl2Si2O10(OH)2
Status: IMA-A (GP)
Mineral for Display: No
|Long Waves (365nm): || Blue ||Weak||Short Waves (254 nm): || Blue ||Weak|
|Other colors LW: || |
Phosphorescence (in the common meaning of the term) seen by naked eye:
Sometimes associated with red fluorescing corundum. Found in a 75 foot wide area of the Franklin Quarry at Franklin, USA.
Main Activator(s) and spectrum:
Best Locality for luminescence(*):
- Franklin Quarry, Franklin Marble, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA (sky blue LW, weaker SW);
- Chester Emery Mines, Chester, Hampden Co., Massachusetts, USA (green LW, nothing SW (De Ment 1947));
(*)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 ,
- Handbook of Fluorescent Gems and Minerals, a practical guide for the gem and mineral collector, Jack de Ment, 1949 ,
Luminescence Reference on internet:
Mineralogical Reference on internet:
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