emerald   (French name: emeraude )


Chemical formula: See BERYL

Family: Silicates

Status: NR

Crystal system : Hexagonal

Display mineral: NON

 

Luminescence:

Longwave UV (365nm) colors:

    


Red ,


Daylight picture


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

Longwave (365nm) picture


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

 

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Phosphorescence (in the common sense of the term) observable with the naked eye:

No phosphorescence visible to the naked eye under any type of UV

Comments:

The gem variety of BERYL of green color.

Activator(s) and spectrum:

Activator(s): Cr3+, Fe3+,  Mn4+,  Mn2+ ,  V2+,  

Peaks in the 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)


Col. G. Barmarin; Spectre: G. Barmarin

Spectrum Galery:

            ...

  
  Accès à la galerie complète (6 images au total)

Comments on spectrum and activators:

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)

 

Best localities for fluorescence (*):

(*)The data are not exhaustive and are limited to a few remarkable localities for fluorescence

Bibliographic reference for luminescence:

Mineralogical reference on the Internet:

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

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

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Note: While all due attention has been paid to the implementation of the database, it may contain errors and/or accidental omissions. By nature, the database will always be incomplete because science always evolves according to new analysis.
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