Database of luminescent minerals 

WEEKSITE

DOUBTFUL FLUORESCENCE but sometimes cited in luminescence literature

Chemical formula: (K,Ba,Ca)₂(UO₂)₂Si₅O₁₃ H₂O

Family: Silicates

Status: IMA-GP

Crystal system : Orthorhombic

Display mineral: NON

Luminescence:

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Phosphorescence (in the common sense of the term) observable with the 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)

Activator(s) and spectrum:

Activator(s): (UO₂)²⁺ (ion Uranyle) intrinsèque ,

Peaks in the spectrum (nm):

UO₂²⁺: 532, 550nm (LW),  511, 531, 553nm (SW)

Col. G. Barmarin; Spectre: G. Barmarin

Spectrum Galery:

  
  Go to the galery (1 spectra)

Comments on spectrum and activators:

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 localities for fluorescence (*):

• Anderson Mine, Date Creek Basin, Yavapai Co., Arizona, USA

(*)The data are not exhaustive and are limited to a few remarkable localities for fluorescence

Bibliographic reference for luminescence:

Reference for luminescence on the Internet:

Mineralogical reference on the Internet:

  http://www.mindat.org/show.php?name=Weeksite

  http://webmineral.com/data/Weeksite.shtml

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