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 5:29 am

All times are UTC - 4 hours




Post new topic Reply to topic  [ 20 posts ]  Go to page Previous  1, 2
Author Message
 Post subject: Re: Smitrine!
PostPosted: Sat Nov 16, 2019 4:01 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
Hi Sandi. Lovely stones by the way.
Stephen what do you think? Mineralogically speaking? Chemically speaking?

PS. Everything on this forum was new to all of us at one time or another. :D


Top
 Profile  
Reply with quote  
 Post subject: Re: Smitrine!
PostPosted: Sat Nov 16, 2019 4:17 pm 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 4015
Location: North Carolina
Something about varying levels of lithium and aluminum, I think. Aluminum helps it acquire and hold a strong smoky color, lithium for the yellow, both for bronze.

_________________
Rough and cut classic and exotic synthetic gems:https://store.turtleshoard.com


Top
 Profile  
Reply with quote  
 Post subject: Re: Smitrine!
PostPosted: Mon Nov 18, 2019 11:47 am 
Offline
New to the Forum or The Quiet Type

Joined: Thu Nov 14, 2019 5:38 pm
Posts: 7
Location: Williams, Oregon
Thank you Barbra and Stephen i am not familiar with all the substances responsible for coloration of stones, wanna educate me?? I m aware of the Manganese and Copper in Tourmalines and what effect they can have on color etc, but the ones you mentioned, i do not know about. If i sent one to GIA would they be able to determine what is in the stones, like what u said LOL
Sandi


Top
 Profile  
Reply with quote  
 Post subject: Re: Smitrine!
PostPosted: Mon Nov 18, 2019 1:13 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
The GIA would not usually list chromophores on an identification report.
Sidebar: Trace amounts of Cu and Mn in tourmaline do not guarantee a vibrant, valuable stone. It depends on the other elements in the caldron. Since the adjective "Paraiba" can result in ridiculously inflated value, sellers look for labs listing Cu and Mn and throwing around "paraiba-type".

Causes of color in Gems:
An Update on Color in Gems. Part 1: Introduction and Colors Caused by Dispersed Metal Ions

An Update on Color in Gems. Part 2: Colors Involving Multiple Atoms and Color Centers

An Update on Color in Gems. Part 3: Colors Caused by Band Gaps and Physical Phenomena


Top
 Profile  
Reply with quote  
 Post subject: Re: Smitrine!
PostPosted: Mon Nov 18, 2019 4:35 pm 
Offline
New to the Forum or The Quiet Type

Joined: Thu Nov 14, 2019 5:38 pm
Posts: 7
Location: Williams, Oregon
thanks Barbra, will need to go back on GIA and read some of their educational materials, fascinating..
Sandi


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 20 posts ]  Go to page Previous  1, 2

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 19 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