Database of luminescent minerals 

chalcedony   (French name: calcedoine )

Chemical formula: See QUARTZ

Status: NR

Crystal system : Polycrystalline

Display mineral: NON

Associated names (luminescent varieties, discredited names, synonyms, etc.): beekite,  youngite,  bois fossile opalise (silicifie), 

Luminescence:

Daylight picture

calcedoine;
Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author

Shortwave (254nm) picture

calcedoine;
UVSW
Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author

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Phosphorescence (in the common sense of the term) observable with the naked eye:

Thermoluminescence: OUI

Activator(s) and spectrum:

Activator(s): (UO₂)²⁺ (ion Uranyle) en impureté,

Peaks in the spectrum (nm):

(UO₂)²⁺ : 502nm, 521nm, 544nm, 568nm, 601nm (fluo green)

569nm, 601nm, 647nm (fluo yellow)

Spectrum Galery:

  
  Go to the galery (2 spectra)

Best localities for fluorescence (*):

• Yankee Dog Field, Hidalgo county, New Mexico, USA;
• Potts Canyon, Near Superior, Arizona, USA;
• Imilchil, Morocco (yellow-orange LW, weak yellowish SW);
• Tampa Bay, Tampa, Hillsborough Co., Florida, USA (agatized coral);

(*)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 ,
• Ultraviolet Light and Fluorescent Minerals, Th. Warren, S. Gleason, R. Bostwick, et E. Verbeek, 1995, ISBN 0-9635098-0-2 ,
• Luminescenza nel regno minerale, Guido Mazzoleni, fotografia Roberto Appiani, Libri Sandit, 2010, ISBN 978-88-95990-63-7 ,
• 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=Chalcedony

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

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