Dec.20 to 22:SAN DIEGO, CALIFORNIA: Wholesale and retail show; Gem Faire Inc.; Scottish Rite Center; Fri. 12-6, Sat. 10-6, Sun. 10-5;
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Fri Dec 06, 2019 6:59 am

All times are UTC - 4 hours




Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: Blue spodumene
PostPosted: Wed May 29, 2019 4:56 pm 
Offline
Gold Member

Joined: Wed Jan 23, 2013 5:29 pm
Posts: 1026
Location: Paris
Is there such a thing as a blue spodumene ?
There is one for sale here (n° 118 - the picture is not so good alas...)
http://fr.zone-secure.net/31103/1015824/#page=53
Comes with a report from a lab I didn't know : AIG, from Belgium.
http://fr.zone-secure.net/31103/1015824/#page=67

Would the color be stable for such a stone ? I guess it's a kind of mineral curiosity... I cannot decide if I find it nice looking or not.


Top
 Profile  
Reply with quote  
 Post subject: Re: Blue spodumene
PostPosted: Wed May 29, 2019 7:16 pm 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 3443
Location: North Carolina
They certainly exist, but the color is not stable. It can also be produced by irradiation similar to the greens and purples, though I think it is more scarce. The color can actually range all the way to aquamarine-like blue without these strong green tones. I have seen speculation that it's a higher oxidation state of manganese that produces it, but that's really just speculation.
Edit: here's a particularly nice picture of one from Salman Khan of Arsaa Gems: https://www.flickr.com/photos/koheqaf/4724218282/
No doubt he's using an LED flashlight which will help push the blue end of the color but still.

_________________
https://www.etsy.com/shop/angryturtle


Top
 Profile  
Reply with quote  
 Post subject: Re: Blue spodumene
PostPosted: Thu May 30, 2019 2:54 pm 
Offline
Gold Member

Joined: Wed Jan 23, 2013 5:29 pm
Posts: 1026
Location: Paris
OK, so I think I'll skip my turn on this one. If the color goes away as soon as it sees a ray of sun...
Already, there is a noticeable color difference between the catalogue picture and the one of the lab report !
Thanks Stephen.

I love this comment on the report, in the "additional grading characteristics" :
"Color grade : Good color quality"
:D :D :D


Top
 Profile  
Reply with quote  
 Post subject: Re: Blue spodumene
PostPosted: Thu May 30, 2019 6:47 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 19939
Location: San Francisco
I bought a blue spodumene from Jason Brim some years back.
He sent it in a black zip lock.
It remains there in the safe, checked periodically: still blue, as of about a year ago.

I got one from another source which came in a transparent gem jar. Today totally colorless.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 3 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