ALLOPHANE
Chemical formula: Al2SiO5 nH2O
Family: Silicates
Status: IMA-GP
Crystal system : Amorphous
Display mineral: NON
Associated names (luminescent varieties, discredited names, synonyms, etc.): collyrite, malthacite, plumballophane,
Luminescence:
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Longwave UV (365nm) colors: | Blue ,
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Shortwave UV (254nm) colors: | Greenish Yellow ,
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Phosphorescence (in the common sense of the term) observable with the naked eye:
No data
Activator(s) and spectrum:
Activator(s): (UO2)2+ (ion Uranyle) en impureté,
Peaks in the spectrum (nm):
500 nm, 523 nm, 550 nm
No spectrum yet
Best localities for fluorescence (*):
- 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);
(*)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 ,
- 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 ,
Reference for luminescence on the Internet:
Mineralogical reference on the Internet:
http://www.mindat.org/show.php?name=Allophane
http://webmineral.com/data/Allophane.shtml
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