• Register

Information for users from the old Q&A site
If you have an account from our old Q&A site, your account was transferred over, but you need to reset your password and confirm your email address.
Reset Password here
Confirm Email here

2,234 questions

3,904 answers


104,108 users

On the dignostics of GARNETS ?

0 votes

How accurate are gfemologic standard-professional reefractometers? If it shows refraction index of 1.73 -the last palac .-3 could be accurate ? Mindat.org gives refaction index data on three decimal lpaces. I've found a blue transparebt gem- 8-9 Cts - on the first sight blue -transparent- like aquamarine or blue topaz or blue tourmaline , hard at least 7 - but for all theese sorts refraction is about 1.63 - 1.65. In the last time special neodium-super magnest are used for a short hand diagnostics. It is possible that. I am from Slovenia (north west of former Yugoslavia. It is historicly known_geologist Chermak /Tscehrmak/čermač discocvered and differentailly doagnostified the Dravite tourmaline near Dravograd/Drauburg exactly in Dobova in 1883.Dravites are lynig in the triangele Dobova_Dravograd_Libelice, surrounded by the rivers Drava (in Latin. Dravium)- Meza _Mislinja. Sholrlite is known as weel here.) Therefore it could be possible- I have blue tourmalina, near the tourmaline paleces is frequently topaz , the stone is not bi-refractive as aquamarine. It could be a very rare blue garnet as well. Garnet are knownhere in Slovenia on Kopaćrni Vrh ( amout 1500 metsts high top of the Pohorje Mounatin nera Maribor ).The bule gem is secondary finding in the porphire-sadn to cover a way in the parks , but due the information the trace leads in mine stone Vard at Vrnika place (quite a Centra Sloveia, abot 700 meters over the sea high ) Otherwise I may show you a 1453 grams /7315 Cts beatufusl large reiverstone of Tourmaline-dravite. Thanks ! (PS the upload for original photos , not URL is not working here )

asked Aug 28, 2012 by Dravinsky (120 points)

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
To avoid this verification in future, please log in or register.