Joined: Mon Oct 17, 2005 2:52 pm Posts: 241 Location: France | French Riviera
Hello,
I want to compare the Vis-NIR spectrum of
vanadium and copper beharing synthetic hydrothermal emerald
with the spectrum of a
natural vanadium beharing emerald from the Salininhas location in brazil.
Thank you to contact me by mp if you have litle sample (rought or cut) of naturel pure vanadium emerald (mostly from Saininhas).
I think I can get a friend to send you some vanadium coloured emerald from Norway if that is of interest? Ain't sure what you mean with "pure vanadium emerald" but I suppose you mean that it shouldn't contain chromium, which the norwegian emeralds are free from (or rather; lack).
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Joined: Wed Apr 26, 2006 12:44 am Posts: 2056 Location: San Francisco
you can check it w/ a chelsa filter.. if no red = vanadium.. ( make sure you check w/ a dichroscope and get the blue/green split ( don't want to be sending vanadium glass now..)
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