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 Post subject: Chrysoberyl
PostPosted: Mon Apr 24, 2017 4:02 am 
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How we identify Vanadium Chrysoberyl I have Raman Ftir and Uv vis Spect.


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 Post subject: Re: Chrysoberyl
PostPosted: Mon Apr 24, 2017 12:31 pm 
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Hi chathurangani and welcome.
I've moved your post to a more appropriate location.
It isn't a chat. :D

It is my understanding that the presence of vanadium in chrysoberyl is usually identified with LA-ICP-MS Analysis.
Perhaps Mikko and Alberto could add to this.


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 Post subject: Re: Chrysoberyl
PostPosted: Tue Apr 25, 2017 2:45 pm 
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Hi,

maybe this helps you...

http://www.viewer.i-version.com/iversio ... =41&end=56

BUT FORGET THE PICTURES!!! The color is terrible and unreal.

Important is the ratio of Vanadium and Chrome ( V3 > Cr3 ) and a very low Iron content.

I have a nice bluishgreen one with a top colour:

Vanadium : 0,06 %
Chrome: 0,01 %
Iron: 0,21 %

So Vanadium is not the main coloring agent. A Chrysoberyl with the same Vanadium and Chrome content but much higher iron content will have a limegreen or yellowishgreen color. Not a "Vanadium Chrysoberyl" imo.

Maybe you post a picture?? Would be great.

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 Post subject: Re: Chrysoberyl
PostPosted: Thu Apr 27, 2017 2:56 pm 
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Vanadium does not produce any PL-reactions in chrysoberyl so Raman spectrometer cannot be used. It does not show up in FTIR either and UV-Vis-NIR spectrum is very much overlapping with the absorption caused by chromium.

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 Post subject: Re: Chrysoberyl
PostPosted: Mon Jun 12, 2017 5:54 am 
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Thank you


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 Post subject: Re: Chrysoberyl
PostPosted: Tue Jun 13, 2017 3:27 pm 
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Maybe this is a dumb question, but isnt the easy answer to look for a rich green color that does not color shift?

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 Post subject: Re: Chrysoberyl
PostPosted: Tue Jun 13, 2017 5:13 pm 
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Stephen Challener wrote:
Maybe this is a dumb question, but isnt the easy answer to look for a rich green color that does not color shift?


Light to medium bluish green...




Attachment:
IMG_0133.PNG
IMG_0133.PNG [ 204.4 KiB | Viewed 1149 times ]


Green, esp. some slightly yellowish green stones are not Vanadium Chrysoberyl imo. Only the 6 stones next to the two colorless from the right are V-Chrysoberyl. The three next to them are green Chrysoberyl.

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