January 24 Through February 4—TUCSON, ARIZONA: Annual show
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Thu Mar 28, 2024 4:58 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 1 post ] 
Author Message
 Post subject: polariscope reaction of polycristalline diamond
PostPosted: Mon May 21, 2012 12:24 pm 
Offline
Gold Member

Joined: Sun Jun 28, 2009 9:56 am
Posts: 1284
Polycristalline diamonds can be transluscent (notably the polycrystalline varieties know as boart which is a granular aggregate and ballas which is a fibrous aggregate).
When transluscent, what reaction should be expected under the polariscope?

As I understand it microcrystalline/cryptocrystalline aggregates will appear light all the time throughout a 360° rotation only if the aggregates is made of anisotropic grains.
So as polycrystalline diamonds are polycrystalline aggregates of fine isotropic grains or fibers, I guess it should either appear dark throughout a 360° rotation, or possibly show polarization anomalies, but it should NOT appear light all the time like anisotropic aggregates do. Am I right?


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 23 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Gemology Style ported to phpBB3 by Christian Bullock