Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
Hi chathurangani and welcome. I've moved your post to a more appropriate location. It isn't a chat.
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.
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.
Joined: Wed Oct 22, 2008 5:00 am Posts: 344 Location: Finland
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.
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...
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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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