Database of luminescent Minerals
NOVACEKITE
Chemical Formula: Mg(UO2)2(AsO4)2 10-12H2O
Familly: Phosphates, Arseniates, Vanadates
Status: IMA-GP
Crystal System: Monoclinic
Mineral for Display: No
Luminescence:
| UV Type | Main color | Intensity | Observation Frequency |
|---|---|---|---|
| Long Waves (365nm): | Yellowish Green | Mid waves (320 nm): | Yellowish Green | Short Waves (254 nm): | Yellowish Green |
Phosphorescence (in the common meaning of the term) seen by naked eye:
No phosphorescence seen by naked eye whatever the type of UV
Comments:
Novacekite can have two forms: nováčekite-I is triclinic while nováčekite-II is monoclinic. Nováčekite-I is very unstable under ambient conditions and quickly dehydrates to nováčekite-II and also to metanováčekite. Most Nováčekite specimens in collections seem to be either nováčekite-II or metanováčekite. Yellowish-green fluorescence vert-jaune: RGB (115, 255, 35) (approximatively calculated from the spectrum)
Main Activator(s) and spectrum:
Most Common Activator: (UO2)2+ (Uranyl ion) intrinsic
Peaks in the spectrum (nm):
(UO2)2+ : 486, 502, 523, 547, 574, 601.6, 633.5nm
... 
To the spectrum gallery (2 spectra in the gallery)
Best Locality for luminescence(*):
- Serra das Éguas, Brumado (Bom Jesus dos Meiras), Bahia, Northeast Region, Brazil;
- Animas Mine, Francisco Portillo, West Camp, Santa Eulalia District, Mun. de Aquiles Serdán, Chihuahua, Mexico;
- Mine No. 18, Paleokamariza Mines, Paleokamariza area, Lavrion District Mines, Lavreotiki, East Attica, Attica, Greece;
(*)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 ,
- Spectroscopic properties of uranium(VI) minerals studied by TRLFS, G. Geipel and Al. Radiochim Acta 88 (2000) ,
Luminescence Reference on internet:
Images :
Mineralogical Reference on internet:
http://www.mindat.org/show.php?name=Novacekite
http://webmineral.com/data/Novacekite.shtml
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