Database of luminescent Minerals


AGRELLITE


Chemical Formula: NaCa2Si4O10F

Familly: Silicates

Status: IMA-A

Crystal System: Triclinic

Mineral for Display: Yes


Luminescence:


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Pink Very weak
Mid waves (320 nm):      Violet Pink Strong
Short Waves (254 nm):      Violet Pink MediumAllways

Daylight Picture


AGRELLITE, Kipawa River, Quebec, Canada;

Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author

Short Waves Pictures (254nm)


AGRELLITE, Kipawa River, Quebec, Canada;
OC (254 nm).
Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author

 

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


No phosphorescence seen by naked eye whatever the type of UV

Comments:


Sometimes associated with : hyalite (fluo green SW), VLASOVITE (fluo yellow-orange SW), feldspath (fluo red SW), red eudyalite and brown mosandrite;


Main Activator(s) and spectrum:


Most Common Activator: Mn2+

Other activators:            Fe3+ , Eu2+ , Ce3+ , Sm3+ , Dy3+ , Nd3+ , Gd3+ ,

Peaks in the spectrum (nm):

Mn2+ replacing Ca2+: Large band peaking at 580nm
Eu2+: 410nm
Sm3+: 560, 597, 602, 640nm
Dy3+: 475, 485, 580nm
Fe3+ replacing Si4+: 740nm
Nd3+(?): 955nm
Ref. sample: (555), (561), 566, (593), (600), 604, (612), (639), 646, 661, 698 and 706 nm


Agrellite, Canada. Excitation: laser 405nm. Col. G. Barmarin; Spectre: G. Barmarin


Comments on activators and spectra:


A brief but distinctive orange flash is seen before the magenta luminescence (typical of Mn activator?).
RE elements (RRE2+ and RRE3+) replacing Ca2+ are suspected as activators. Also Mn and Fe.
Fluorescence: pink LW after Robbins and other authors, clearly visible with pointer-laser @405nm.
As with other minerals activated by RRE, the shape of the spectrum is strongly influenced by the resolution of the spectrometer because RRE have a lot of very narrow peaks very close from each other. If the resolution of the spectrometer is not sufficient, the pikes are agglomerated in larger entities.


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=Agrellite

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

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