Chemical Formula:See BERYL
Familly: Silicates
Status: NR
Crystal System: Hexagonal
Mineral for Display: No
UV Type | Main color | Intensity | Observation Frequency |
---|---|---|---|
Long Waves (365nm): | Red | ||
Daylight Picture
Emeraude, Muzo, Colombia;
Photo and Copyright: Richard Loyens
Long Waves Picture (365nm)
Emeraude, Muzo, Colombia;
fluo red, excitation: laser 405nm
Photo and Copyright: Richard Loyens
The gem variety of BERYL of green color.
Most Common Activator: Cr3+
Other activators: 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
To the spectrum gallery (3 spectra in the gallery)
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)
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
http://www.mindat.org/show.php?name=Emerald
http://webmineral.com/data/Emerald.shtml
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