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:


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Orange
Short Waves (254 nm):      Blue
Other colors SW:     
Bluish White ,
 

Phosphorescence (in the common meaning of the term) seen by 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)


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 

No spectrum for the moment

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(*):


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


Bibliographical Reference for luminescence:



Mineralogical Reference on internet:


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

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

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