Database of luminescent Minerals


GYPSUM


Chemical Formula: CaSO4 2H2O

Familly: Sulfates

Status: IMA-GP

Crystal System: Monoclinic

Mineral for Display: Yes

Associated names (luminescent varieties, discredited names, synonymes etc.):  alabasterselenite

Luminescence:


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Yellowish White MediumOften
Short Waves (254 nm):      Bluish White MediumOften
Other colors LW:                                   
White , Bluish White , Pale Yellow , Orangy yellow , Greenish , Greenish white , Yellowish ,
Other colors SW:                                             
White , Bluish White , Yellowish White , Pinkish White , Pale Yellow , Yellowish Green , Greenish , Greenish white , Yellowish ,

Long Waves Picture (365nm)


OL (365 nm). Col. G. Barmarin; Photo: G. Barmarin

Short Waves Pictures (254nm)


OC (254 nm). Col. G. Barmarin; Photo: G. Barmarin

 

Galerie de photos:

            ...

     To the gallery (15 images in the gallery)


Phosphorescence (in the common meaning of the term) seen by naked eye:


UV Type Color Intensity Observation Frequency
Long Wave (365nm): Yellowish White Strong
Short Waves (254 nm): Bluish White Strong
 

Comments:


Syn: selenite;
Sometimes presents a hourglass fluorescing figure in the center of monocrystals.


Main Activator(s) and spectrum:


Most Common Activator: Organic impurities

Other activators:            (UO2)2+ (Uranyl ion) as impurities ,

Peaks in the spectrum (nm):

ST  : 440-630nm 

494nm, 510nm, 544nm, 601nm (Hourglass figure, Canada)

 UO22+ : 469, 486, 507, 530, 554nm (sample from Morrocco)


Col. G.Barmarin; Photo: G. Barmarin

      ...

  To the spectrum gallery (2 spectra in the gallery)


Comments on activators and spectra:


Typical uranyl spectrum when green luminescence is present.
Greenish-white and bluish fluorescence most probably due to organic impurities.


Best Locality for luminescence(*):


(*)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=Gypsum

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

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Note: While all due attention has been paid to the implementation of the database, it may contain errors and/or accidental omissions. By nature, the database will always be incomplete because science always evolves according to new analysis.
A request providing no result means only that no such reference exists in the database, but it does not mean that what you are looking for does not exist, just not to our knowledge. If you think you have found an error or omission, please let us know via the contact page being sure to cite the source of information.

 


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