Database of luminescent Minerals
WEEKSITE
DOUBTFULL FLUORESCENCE but cited by some authors
Chemical Formula: (K,Ba,Ca)2(UO2)2Si5O13 H2O
Familly: Silicates
Status: IMA-GP
Crystal System: Orthorhombic
Mineral for Display: No
Luminescence:
| UV Type | Main color | Intensity | Observation Frequency |
|---|---|---|---|
| Long Waves (365nm): | Yellowish Green | Very weak | Mid waves (320 nm): | Yellowish Green | Weak | Short Waves (254 nm): | Yellowish Green | Weak |
Phosphorescence (in the common meaning of the term) seen by naked eye:
No Data
Comments:
Usually cited as non-fluorescent in the litterature despite pictures and samples in collection; identification to be verified; Fluorescent Hyalite can cover weeksite xls or xls can be included in strong fluorescent chalcedony making difficult to say in some samples if weeksite does fluoresce by itself or not (see sample from Thomas range Mountains, USA on Mindat) A crystallized sample corresponding to the facies of the weeksite and labelled as such from the Anderson Mine clearly shows a low fluorescence from the crystals themselves (no visible hyalite coating) and a spectrum could even be taken. Yellowish green fluorescence: RGB: 175, 255, 30 (approximatively calculated from the spectrum)
Main Activator(s) and spectrum:
Most Common Activator: (UO2)2+ (Uranyl ion) intrinsic
Peaks in the spectrum (nm):
UO22+: 532, 550nm (LW), 511, 531, 553nm (SW)
Col. G. Barmarin; Spectre: G. Barmarin
... 
To the spectrum gallery (2 spectra in the gallery)
Comments on activators and spectra:
The peaks of the spectrum are not very well defined but there is clearly a peak around 532nm and a second one at 550nm. Other peaks should be found after deconvolution of the spectrum but are only slightly visible as shoulders in the curve.
Best Locality for luminescence(*):
- Anderson Mine, Date Creek Basin, Yavapai Co., Arizona, USA
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
Bibliographical Reference for luminescence:
Luminescence Reference on internet:
Mineralogical Reference on internet:
http://www.mindat.org/show.php?name=Weeksite
http://webmineral.com/data/Weeksite.shtml
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