Database of luminescent Minerals


DELHAYELITE


Chemical Formula: (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 18H2O

Familly: Silicates

Status: IMA-GP

Crystal System: Orthorhombic

Mineral for Display: No


Luminescence:


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Orange Strong
Short Waves (254 nm):      Orange Medium
 

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


No Data

Comments:


Named in 1959 by Th. G. Sahama and K. Hytönen after Fernand Delhaye (Clermont-Ferrand February 4 1880 - Saint-Gillis (Brussels) December 15 1946), of Belgian nationality. He worked in Central Africa (Type locality for Delhayeite: Mt Shaheru, Mt Nyiragongo, Goma, Kivu, Democratic Republic of Congo (Zaïre) type specimen conserved at Royal Museum for Central Africa, Tervuren seems not to be luminescent).


Main Activator(s) and spectrum:


Most Common Activator: S2-

Other activators:            Ce3+ , Sm3+ , Eu3+ , Dy3+ , Mn2+ , Nd3+ ,

Peaks in the spectrum (nm):

S2- : large band centered at  620nm with weak vibrational structure (564, 584, 608, 622, 645, 664, 692, 719, 747nm)


Delhayelite.
Excitation: laser 405nm. Col. G. Barmarin; Spectre: G. Barmarin

         ...

  To the spectrum gallery (3 spectra in the gallery)


Comments on activators and spectra:


Delhayelite was studied by steady-state luminescence and S2- , trivalent REE, such as Ce, Dy, Sm, and Mn2+ were found.

 

Excitation by CW laser at 532 and 785 nm revealed trivalent REE, mainly Eu and Nd, and evidently S2-  band (Gaft).


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=Delhayelite

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

Search on Internet:

  Search for images on 'Google Image'

  Search for documents in English on Google

  Search for documents in any languages on Google

  Search on Wikipédia


 

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.

 


Quick search by fluorescent mineral name: