Database of luminescent Minerals

EUDIALYTE

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

Familly: Silicates

Status: IMA-A (GP)

Crystal System: Rhomboedric

Mineral for Display: No

Luminescence:

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

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)

Main Activator(s) and spectrum:

Most Common Activator: Mn²⁺

Other activators:            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 

Comments on activators and spectra:

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 Locality for luminescence(*):

• 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);

(*)Data are not exhaustive and are limited to the most important localities for fluorescence

Bibliographical 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 internet:

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

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

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