Database of luminescent minerals 

HALLOYSITE

Chemical formula: Al₂Si₂O₅(OH)₄ 2H₂O

Family: Silicates

Status: IMA-A

Display mineral: NON

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

Luminescence:

Daylight picture

Longwave (365nm) picture

Shortwave (254nm) picture

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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):

UO₂²⁺ : 499, 519, 542, 565nm

Comments on spectrum and activators:

Typical spectrum of Uranyl Impurities

Best localities for fluorescence (*):

• Vardasen Quarry near Larvik, Langesundfjord, Larvik Plutonic Complex, Norway;
• Ilimaussaq complex, Kvanefjeld, Narsaq, Kitaa (West Greenland) Province, Greenland;
• Beez, Belgium;

(*)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 ,
• The World of Fluorescent Minerals, Stuart Schneider, Schiffer Publishing, 2006, ISBN 0-7643-2544-2 ,

Reference for luminescence on the Internet:

Mineralogical reference on the Internet:

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

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

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