chalcedony
Chemical Formula:See QUARTZ
Status: NR
Crystal System: Polycrystalline
Mineral for Display: No
Associated names (luminescent varieties, discredited names, synonymes etc.):
beekite, youngite, opalized wood (fossil),
Luminescence:
UV Type |
Main color |
Intensity |
Observation Frequency |
|
| | | |
Long Waves (365nm): | Greenish white | | | Short Waves (254 nm): | Green | | | | | | |
Other colors LW: | Yellow , Orangy yellow , |
Other colors SW: | Yellowish White , Tawn , |
Daylight Picture
calcedoine;
Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author
Short Waves Pictures (254nm)
calcedoine;
UVSW
Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author
Phosphorescence (in the common meaning of the term) seen by naked eye:
UV Type |
Color |
Intensity |
Observation Frequency |
Long Wave (365nm): | Pale Yellow | | |
Short Waves (254 nm): | Greenish white | | |
Thermoluminescence: Yes
Main Activator(s) and spectrum:
Most Common Activator: (UO2)2+ (Uranyl ion) as impurities
Peaks in the spectrum (nm):
(UO2)2+ : 502nm, 521nm, 544nm, 568nm, 601nm (fluo green)
569nm, 601nm, 647nm (fluo yellow)
...
To the spectrum gallery (1 spectra in the gallery)
Best Locality for luminescence(*):
- 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);
(*)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 ,
- 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 ,
Luminescence Reference on internet:
Mineralogical Reference on internet:
http://www.mindat.org/show.php?name=Chalcedony
http://webmineral.com/data/Chalcedony.shtml
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