Lijst van fluorescerende mineralen


FLUORITE


Scheikundige formule: CaF2

Familie: Halogeniden

Status: IMA-GP

Kristal Systeem: Cubisch

Mineraal om tentoon te stellen: Ja

Fluorescerende variëteiten:  chlorophaneyttrofluoriteyttroceriteTiffany stonefluoriet

Fluorescentie:


UV Type Kleur Intensiteit Frequentie van de observatie
Lange Golven (365nm):      Blauw Zeer sterkDikwijls
Midden Golven (320 nm):      Blauw MiddelmatigSoms
Korte Golven(254 nm):      Blauw MiddelmatigSoms
    
Andere kleuren lange golven:                                                                 
Blauw wit , Gelig wit , Bleek geel , Geel , Bruin , Rood , Violet roos , Groen , Groenachtig , Violet , Groen wit , Violet blauw , Geelachtig ,
Andere kleuren Midden golven:     
Groen ,
Andere kleuren korte golven:                                                                      
Witte , Blauw wit , Gelig wit , Bleek geel , Geel , Bruin , Rood , Groen , Groenachtig , Blauw groen , Violet , Groen wit , Violet blauw , Geelachtig ,

Daglicht foto


FLUORITE;
Blue Circle Cement Quarry, Eastgate, Weardale, North Pennines, County Durham, England, UK
Photo and Copyright:
Middleearthminerals.com
Used with permission of the author

Lange golf foto (365nm)


FLUORITE;
Blue Circle Cement Quarry, Eastgate, Weardale, North Pennines, County Durham, England, UK
UVLW, Photo and Copyright:
Middleearthminerals.com
Used with permission of the author

 

Foto galerij:

            ...

     Naar de volledige galerij (30 beelden in totaal)


Fosforescentie (in de algemene betekenis) zien met het blote oog:


UV Type Kleur Intensity Observation Frequency
Lange golven(365nm): Groen wit SterkZelden
Midden Golven (320 nm): Groen wit
Korte golven (254 nm): Groen wit
 

Triboluminescencie: Ja

Thermoluminescencie: Ja


Commentaar:


The classical fluorescing mineral but all fluorites are not luminescent under UV !


CHLOROPHANE variety : green thermoluminescence ;


YTTROFLUORITE variety: SW and LW : yellow, yellowish-white (cream);

 


Activator en spectrum:


Voornaamste Activator: Eu2+

Andere activatoren: Onzuiverheden organisch materiaal , Sm2+ , Ce3+ , Sm3+ , Eu3+ , Dy3+ , Ho3+ , Er3+ , Tb3+ , Pr3+ , Nd3+ , Yb3+ , Tm3+ ,

Pieks in het spectrum (nm):

Eu2+ repl. Ca2+: 423-425nm (associated with deep blue-violet fluorescence)
Sm2+ repl. Ca2+: 708, 733nm
Yb2+ repl. Ca2+: 550nm
Dy3+:468, 478, 575, 654, 658, 663, 671, 685nm
Tb3+:482, 484, 486, 492, 539, 543, 544, 546, 583, 588nm
Er3+:519, 522, 528, 551, 554nm
Sm3+:561nm
Eu3+: 574, 595, 618, 622, 700nm
Nd3+: 920nm
M-center(2F+Na+): large pic at 720-745 nm
MA center charge stabilized by O2−–F  : 690 nm 
MA center charge stabilized by Na+–Ca2+ : 750nm


Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.

            ...

  Vers la galerie de spectres (18 spectres au total)


Commentaar over activators en spectra:


Violet fluo associated with Eu2+ (420-423 nm) with peaks at 320 and 340nm (Ce3+),  decay time of Eu2+ is 600–800 ns
yellow fluo associated with Dy3+;
M-center: large pic at 720 nm;
Lifetime: 2μs ( @420nm);

λex = 415 nm is most suitable for measuring the Ho3+ emission beside the Er3+

Fluorite was one of the first mineral substances being investigated by George G. Stokes in 1852, hence the name fluorescence given at the phenomenon.

Fluorite is a reservoir for many of the rare earth elements. As early as 1881, it was pointed out that Cerium was present in fluorite.

In 1906, Urbain studied the cathodoluminescence of fluorite and ascribed the cause of fluorescence to RRE (Yttrium, praeseodymium, samarium, dysprosium, europium, terbium and also gadolinium and Ytterbium in chlorophane); Morse (1907), Tanaka (1924), Nichols (1928) and F. G. Wick also investigated the cause of luminescence of fluorite. 

The fusion of fluorescent fluorite (1100-1200°C) changes the spectrum markedly. Often the blue luminescence spectrum is changed to a more orange-red, showing sharp lines typical of RRE.

De Ment makes 2 groups in the luminescent fluorites:

group 1: single band in the UV at 300nm and 3 bands in the visible at 475, 508 and 578nm
group 2: two bands in UV at 280 and 300nm and strong peaks at 475, 510, 536, 548 and 578nm in the visible.

Radiation induced MA centers’ charge stabilized by Na+–Ca2+ is responsible of emission at 750nm and O2−–F at 690 nm) (Tarashchan 1978, Gaft and Al. 2020).


Beste vindplaats voor fluorescentie(*):


(*)Gegevens zijn niet exhaustieve, ze zijn beperkt tot de meest belangrijke plaatsen voor fluorescentie


Referentie voor fluorescentie:



Referentie voor luminenscentie op het internet:



Mineralogische Referentie op het internet:


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

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

Onderzoek op Internet:

  Beelden op 'Google Image'

  Dokumenten in het Nederlands op Google

  Dokumenten in alle talen op Google

  Onderzoek op Wikipédia


 

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Snel opzoeking van een fluorescerend mineraal: