Database of luminescent minerals 

EUDIALYTE

Chemical formula: Na₁₅Ca₆(Fe⁺²,Mn⁺²)₃Zr₃(Si,Nb)(Si₂₅ O₇₃)(O,OH,H₂O)₃(Cl,OH)₂

Family: Silicates

Status: IMA-A (GP)

Crystal system : Rhomboedric

Display mineral: NON

Luminescence:

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Phosphorescence (in the common sense of the term) observable with the naked eye:

No data

Comments:

From Alluaiv, Russia a specimen of this manganese zirconium hydroxy silicate is said to be iron free, and fluoresces orange under LW.

Strange altered pink pseudomorphs of eudialyte on apophyllite from the Diamond Jo quarry, Magnet Cove, Arkansas fluoresce blue under SW UV and is likely fine-grained mixtures containing benitoite and something else. This type of alteration is common in the nearby Jones Mill quarry. (see picture on mindat: https://www.mindat.org/photo-750511.html)

Activator(s) and spectrum:

Activator(s): Mn²⁺ , Cr³⁺,  Ti³⁺,  Eu³⁺,  Nd³⁺,  

Peaks in the spectrum (nm):

Mn²⁺ substituting Ca²⁺ : 590 nm 
Ti³⁺ intrins. : 670 nm  (Gorobets)
(?) : two luminescence bands peaking at 650 and 700 nm 

No spectrum yet

Comments on spectrum and activators:

Excitation by CW laser with 532 and 780 nm revealed narrow luminescence lines possibly belonging to trivalent REE (Nd³⁺, Eu³⁺) and Cr³⁺ and two luminescence bands peaking at 650 and 700 nm 

Best localities for fluorescence (*):

• Shkatulka pegmatite, Umbozero mine, Alluaiv Mt, Lovozersky District, Murmansk Oblast, Russia;
• Diamond Jo Quarry and Jones Mill quarry, Magnet Cove, Hot Spring Co., Arkansas, USA (pink pseudomorphoses fluo blue SW associated with apophyllite);

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

Bibliographic reference for luminescence:

• Luminescence Spectroscopy of Minerals and Materials, M. Gaft, R. Reisfeld, G. Panczer, Springer Editor, ISBN: 10 3-540-21918-8 ,
• Luminescent Spectra of Minerals, Boris S. Gorobets and Alexandre A. Rogojine, Moscow, 2002 ,

Mineralogical reference on the Internet:

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

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

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