ALLOPHANE
Chemical Formula: Al2SiO5 nH2O
Familly: Silicates
Status: IMA-GP
Crystal System: Amorphous
Mineral for Display: No
Associated names (luminescent varieties, discredited names, synonymes etc.):
collyrite, malthacite, plumballophane,
Luminescence:
UV Type |
Main color |
Intensity |
Observation Frequency |
|
| | | |
Long Waves (365nm): | Blue | | | Short Waves (254 nm): | Greenish Yellow | | | | | | |
Phosphorescence (in the common meaning of the term) seen by naked eye:
No Data
Main Activator(s) and spectrum:
Most Common Activator: (UO2)2+ (Uranyl ion) as impurities
Peaks in the spectrum (nm):
500 nm, 523 nm, 550 nm
No spectrum for the moment
Best Locality for luminescence(*):
- Resin Hollow, Mammoth Cave, Ky, USA (cream white + phosphorescence);
- Banská Štiavnica (Schemnitz), Banská Štiavnica Co., Banská Bystrica Region, Slovakia (var. collyrite, pale brown);
- Jihocesky Kraj, Czech Rep. (var. malthacite, bright blue);
- Grafenthal, Germany (light blue SW (De Ment));
- Etienne mine, Schemnitz, Hungary (var. collyrite, white-brown, SW) (actual name: Banská Štiavnica (Schemnitz)?);
- Steindorfel, Czechoslovakia (?) (var. Malthacite, bright blue SW);
- Montevecchio, Sardinia, Italy (var. plumballophane, bright blue, SW);
(*)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 ,
- Luminescent Spectra of Minerals, Boris S. Gorobets and Alexandre A. Rogojine, Moscow, 2002 ,
- 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:
http://www.mindat.org/show.php?name=Allophane
http://webmineral.com/data/Allophane.shtml
Search on Internet:
Search for images on 'Google Image'
Search for documents in English on Google
Search for documents in any languages on Google
Search on Wikipédia
Note: While all due attention has been paid to the implementation of the database, it may contain errors and/or accidental omissions. By nature, the database will always be incomplete because science always evolves according to new analysis.
A request providing no result means only that no such reference exists in the database, but it does not mean that what you are looking for does not exist, just not to our knowledge. If you think you have found an error or omission, please let us know
via the contact page being sure to cite the source of information.