PARAKELDYSHITE
Chemical Formula: Na2ZrSi2O7
Status: IMA-A
Mineral for Display: No
Luminescence:
UV Type |
Main color |
Intensity |
Observation Frequency |
|
| | | |
Long Waves (365nm): | Orangy yellow | Strong | | Short Waves (254 nm): | White | Strong | | | | | |
Other colors LW: | Yellowish White , |
Other colors MW: | Yellowish White , Pale Yellow , |
Other colors SW: | Yellowish White , Pale Yellow , Orangy yellow , Pink , Blue , |
Daylight Picture
KELDYSHITE and PARAKELDYSHITE xls, Mt Rasvumchorr, Khibiny massif,
Kola peninsula, MurmanskajaOblast, Russia;
Copyright 2006 S. Schneider,
The World of Fluorescent Minerals,
Used with permission of the author,
Short Waves Pictures (254nm)
KELDYSHITE and PARAKELDYSHITE xls, Mt Rasvumchorr, Khibiny massif,
Kola peninsula, MurmanskajaOblast, Russia;
Keldyshite fluoresce yellow SW and parakeldyshite white SW,
Copyright 2006 S. Schneider,
The World of Fluorescent Minerals,
Used with permission of the author,
Phosphorescence (in the common meaning of the term) seen by naked eye:
No Data
Comments:
See KELDYSHITE.
Main Activator(s) and spectrum:
Most Common Activator: n[TiO6] cluster
Peaks in the spectrum (nm):
Very large band with max at 560 nm (Gorobets)
No spectrum for the moment
Comments on activators and spectra:
Blue luminescence due to TiO6 ?
Cathodoluminescence: dark-blue.
Best Locality for luminescence(*):
- Pegmatite Roadcut at Bratthagen, Lågendalen, Hedrum, Larvik, Vestfold, Norway ;
- Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada;
- Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast, Northern Region, Russia (yellow SW);
- Lovozero, Kola peninsula, Murmanskaja Oblast, Russia ;
(*)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 ,
- Luminescent Spectra of Minerals, Boris S. Gorobets and Alexandre A. Rogojine, Moscow, 2002 ,
- Mt St Hilaire Website: http://www.saint-hilaire.ca ,
Luminescence Reference on internet:
- The Langesundsfjord: history, geology, pegmatites, minerals, Alf Olav Larsen, Bode Verlag Gmbh, 2010 ISBN 978-3-925094-97-2
- MONT-SAINT-HILAIRE, History, Geology, Mineralogy, Laszlo HORVATH, The Canadian Mineralogist, Special Publication 14, 2019
Images:
Mineralogical Reference on internet:
http://www.mindat.org/show.php?name=Parakeldyshite
http://webmineral.com/data/Parakeldyshite.shtml
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