hyalite
Chemical Formula:See OPALE
Familly: Oxides and hydroxides
Status: NON APPR
Crystal System: Amorphous
Mineral for Display: Yes
Luminescence:
UV Type |
Main color |
Intensity |
Observation Frequency |
|
| | | |
Long Waves (365nm): | Green | Weak | Often | Mid waves (320 nm): | Green | | | Short Waves (254 nm): | Green | Strong | Very often | | | | |
Daylight Picture
Hyalite, Valeč, Czech Republic;
Col. G.Barmarin; Photo: G. Barmarin
Short Waves Pictures (254nm)
Hyalite, Valeč, Czech Republic; UVSW
Col. G.Barmarin; Photo: G. Barmarin
Galerie de photos:
...
To the gallery (8 images in the gallery)
Phosphorescence (in the common meaning of the term) seen by naked eye:
No phosphorescence seen by naked eye whatever the type of UV
Comments:
A colourless variety of Opal. Hyalite is opal-AN, an amorphous silica-glass containing about 3-8% water.
Hyalite is quite often present as a coating almost invisible to the naked eye on quartz, feldspar, topaz, black tourmaline, aquamarine etc. falsely suggesting that these minerals fluoresce.
Main Activator(s) and spectrum:
Most Common Activator: (UO2)2+ (Uranyl ion) as impurities
Peaks in the spectrum (nm):
UO22+ : 503, 524, 547, 570, 600nm
Col. G. Barmarin; Spectre: G. Barmarin
Comments on activators and spectra:
Typical spectrum of Uranyl impurities.
Best Locality for luminescence(*):
- Valeč (Waltsch), Doupov, Karlovy Vary Region, Bohemia, Czech Republic ;
- Tarcal, Eperjes-Tokaj Mts., Borsod-Abaúj-Zemplén, Hungary (coming on the market in Munchen in 2014, fluo strong green SW, moderate green LW);
- Kopasz Hill, Tállya, Zemplén Mountians, Borsod-Abaúj-Zemplén County, Hungary
- Monok, Zemplén Mts, Hungary ;
- Bárdos Hill, Gyöngyössolymos, Heves County, Mátra, Hungary ;
- Chalk Mountain Mine, Spruce Pine, Spruce Pine District, Mitchell Co., North Carolina, USA ;
- Erongo Mountains, Namibia ;
- Lesbos Island, Lésvos Prefecture, Aegean Islands Department, Greece (very similar to samples of Czech Republic);
- Squaretop Mountain, Kaimkillenbun, Wambo Shire, Western Downs Region, Queensland, Australia (similar to samples of Czech Republic but moderate lime-green fluo SW);
- Zacatecas, Mexico (coming on the market in 2014 in Tucson, very strong green fluo even in daylight!);
(*)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 ,
- 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=Hyalite
http://webmineral.com/data/Hyalite.shtml
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