Lijst van fluorescerende mineralen

emerald

Scheikundige formule:Zie BERYL

Familie: Silicaten

Status: NR

Kristal Systeem: Hexagonal

Mineraal om tentoon te stellen: Nee

Fluorescentie:

Daglicht foto

Emeraude, Muzo, Colombia;
Photo and Copyright: Richard Loyens

Lange golf foto (365nm)

Emeraude, Muzo, Colombia;
fluo red, excitation: laser 405nm
Photo and Copyright: Richard Loyens

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

Commentaar:

The gem variety of BERYL of green color.

Activator en spectrum:

Voornaamste Activator: Cr³⁺

Andere activatoren: Fe³⁺ , Mn⁴⁺ , Mn²⁺ , V²⁺ ,

Pieks in het spectrum (nm):

Cr³⁺ : Lines at 682, 683, 684nm, 

Cr³⁺ replacing Al³⁺ : broad band peaking at 730nm  

Cr³⁺ : (666), 685, (696), 

Cr³⁺ I: 725nm (Band)

Cr³⁺ II: 715nm (Band)

Fe³⁺ : broad band at 735nm

Cr³⁺ , V²⁺, Mn⁴⁺ : broad band at 720 (Lifetime = 100 microsecondes)

VO₄ : 423 (Lifetime = 1 microseconde)

  Vers la galerie de spectres (3 spectres au total)

Commentaar over activators en spectra:

Steady-state emission of beryl was previously studied.

The broad band at 720 nm is connected with Fe³⁺, while the relatively narrow bands at 480 and 570 nm are ascribed to Mn²⁺ in tetrahedral and octahedral coordination, correspondingly.

Cr³⁺ emission was connected with narrow R-lines at 680 and 682 nm (Tarashchan 1978; Kuznetsov and Tarashchan 1988). (Cr³⁺ impurity ions in highly distorted octahedron sites)

The Cr³⁺ luminescence properties in natural beryl minerals have been studied as a function of the Cr content as well as impurities such as Fe and V. It appears that the Cr³⁺ crystal field is linked to the Cr amount and decreases when Cr increases. A competition between Cr and V was noticed for very low Cr concentration (Ollier et al. 2015). (Gaft)

Beste vindplaats voor fluorescentie(*):

• Muzo Mine, Mun. de Muzo, Vasquez-Yacopí Mining District, Boyacá Department, Colombia;
• Brumado, Bahia, Brazil (red LW);

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

Referentie voor fluorescentie:

• The Henkel Glossary of Fluorescent Minerals, Dr. Gerhard Henkel, Published by the FMS, 1989 ,
• 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 ,

Mineralogische Referentie op het internet:

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

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

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