Database of luminescent minerals 

PREHNITE

Chemical formula: Ca₂Al₂Si₃O₁₀(OH)₂

Family: Silicates

Status: IMA-GP

Crystal system : Orthorhombic

Display mineral: NON

Luminescence:

Daylight picture

Longwave (365nm) picture

Prehnite UVLW, Jeffrey Mine, Asbestos, Québec, Canada;
Col. G. Barmarin; Photo: G. Barmarin

Shortwave (254nm) picture

Prehnite UVSW, Jeffrey Mine, Asbestos, Québec, Canada;
Col. G. Barmarin; Photo: G. Barmarin

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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): Pb²⁺,

Peaks in the spectrum (nm):

Pb²⁺ : 356nm (exc. 266nm, t = 300ns)

Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.

Comments on spectrum and activators:

Jeffrey Mine: bluish fluorescence under long wave UV illumination, plus orange-fluorescing coating by an unknown mineral (see picture above)

Best localities for fluorescence (*):

• Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA;
• Jeffrey Quarry, Asbestos, Shipton Township, Richmond Co., Québec, Canada;
• Jeffrey Mine, Asbestos, Les Sources RCM, Estrie, Québec, Canada;
• Ilimaussaq complex, Kvanefjeld, Narsaq, Kitaa (West Greenland) Province, Greenland;
• Taza, Taza Province, Taza-Al Hoceïma-Taounate Region, Morocco (dull luminescence SW+LW);
• Near Langban, Sweden (SW White);

(*)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 ,
• Luminescence Spectroscopy of Minerals and Materials, M. Gaft, R. Reisfeld, G. Panczer, Springer Editor, ISBN: 10 3-540-21918-8 ,

Reference for luminescence on the Internet:

Mineralogical reference on the Internet:

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

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

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