Database of luminescent minerals 

DELHAYELITE

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

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:

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).

Activator(s) and spectrum:

Activator(s): S₂^-, Ce³⁺,  Sm³⁺,  Eu³⁺,  Dy³⁺,  Mn²⁺ ,  Nd³⁺,  

Peaks in the spectrum (nm):

S^2- : 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

Spectrum Galery:

  
  Go to the galery (6 spectra)

Comments on spectrum and activators:

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 localities for fluorescence (*):

• Kirovskii apatite mine, Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast, Northern Region, Russia;
• Yukspor Mt, Khibiny Massif, Murmansk Oblast, Russia;
• Koashva Open Pit, Koashva Mt, Khibiny Massif, Murmansk Oblast, Russia;
• Rasvumchorr Mine, Rasvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia;

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

Bibliographic reference for luminescence:

• Fluorescence: Gems and Minerals Under Ultraviolet Light, Manuel Robbins, 1994, Geoscience Press, ISBN 0-945005-13-X ,
• Luminescent Spectra of Minerals, Boris S. Gorobets and Alexandre A. Rogojine, Moscow, 2002 ,

Reference for luminescence on the Internet:

Mineralogical reference on the Internet:

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

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

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