New Mineral Named After GIA’s John Koivula
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Fri Oct 18, 2019 9:58 am

All times are UTC - 4 hours




Post new topic Reply to topic  [ 14 posts ] 
Author Message
 Post subject: Mystery stone
PostPosted: Tue Jun 11, 2019 10:26 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 19856
Location: San Francisco
I got an email today from someone asking me for an ID for a stone.
I dunno :|

Anyone have an idea?
Image
Image


Top
 Profile  
Reply with quote  
 Post subject: Re: Mystery stone
PostPosted: Wed Jun 12, 2019 12:00 pm 
Offline
Gemology Online Veteran
User avatar

Joined: Sat May 22, 2010 2:51 am
Posts: 698
Location: Cape Town, South Africa
Low quality amber, or perhaps an amber simulant?


Top
 Profile  
Reply with quote  
 Post subject: Re: Mystery stone
PostPosted: Fri Jun 14, 2019 10:23 am 
Offline
Gold Member

Joined: Wed Jan 23, 2013 5:29 pm
Posts: 1015
Location: Paris
Amber would be my first guess too.
Might be amber amber made of several pieces of amber pressed together. Very common.
How does it react to a hot needle ? Provided that you can try in an hidden place of the material.


Top
 Profile  
Reply with quote  
 Post subject: Re: Mystery stone
PostPosted: Fri Jun 14, 2019 2:49 pm 
Offline
Valued Contributor

Joined: Sun Sep 04, 2016 8:07 am
Posts: 125
When I saw it my first thought was brecciated jasper or maybe dino bone.

Can you remove the stone for testing? Looks like it might be glued in as the bezel is not over the stone.

Jim


Top
 Profile  
Reply with quote  
 Post subject: Re: Mystery stone
PostPosted: Fri Jun 14, 2019 7:46 pm 
Offline
Gemology Online Veteran

Joined: Thu May 12, 2016 2:18 am
Posts: 630
Looks like amber to me as well.


Top
 Profile  
Reply with quote  
 Post subject: Re: Mystery stone
PostPosted: Sun Jun 16, 2019 1:49 pm 
Offline
Valued Contributor

Joined: Sun Sep 04, 2016 8:07 am
Posts: 125
You guys really think it looks like amber? I always thought amber was translucent.
Anyone have an example that looks like the stone in question?

Thanks, Jim


Top
 Profile  
Reply with quote  
 Post subject: Re: Mystery stone
PostPosted: Sun Jun 16, 2019 4:06 pm 
Offline
Established Member

Joined: Mon May 20, 2019 3:47 pm
Posts: 36
Hard to say.

Ivar. Yellow yolk amber or could be yellow jasper,

Could be any of them :/

yellow jasper
Attachment:
il_fullxfull_709112718_9x0h.jpg
il_fullxfull_709112718_9x0h.jpg [ 74.92 KiB | Viewed 649 times ]


Yellow yolk amber
Attachment:
Untitled-1 copy.jpg
Untitled-1 copy.jpg [ 373.11 KiB | Viewed 649 times ]


Top
 Profile  
Reply with quote  
 Post subject: Re: Mystery stone
PostPosted: Sun Jun 16, 2019 4:18 pm 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 3398
Location: North Carolina
For the record, I don't think the example above is actually yellow jasper. Those flow lines do not look like patterning you'd expect to see in jasper, or almost any natural material.
Also definitely not dino bone or brecciated jasper.

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


Top
 Profile  
Reply with quote  
 Post subject: Re: Mystery stone
PostPosted: Sun Jun 16, 2019 4:32 pm 
Offline
Established Member

Joined: Mon May 20, 2019 3:47 pm
Posts: 36
Stephen Challener wrote:
For the record, I don't think the example above is actually yellow jasper. Those flow lines do not look like patterning you'd expect to see in jasper, or almost any natural material.
Also definitely not dino bone or brecciated jasper.


I did google Yellow Jasper rings and some are like that, Then again I don't know if
there been enhanced in some way as you don't know now adays, Many do have flow lines as you say.

Id say ring could be egg yolk amber tbh. but that's my thought with googling
cab rings, Thought i'd try and help.

egg yolk amber.
Attachment:
silver-brooch-butterscotch-egg-yolk-amber.jpg
silver-brooch-butterscotch-egg-yolk-amber.jpg [ 6.63 KiB | Viewed 643 times ]


Top
 Profile  
Reply with quote  
 Post subject: Re: Mystery stone
PostPosted: Sun Jun 16, 2019 4:48 pm 
Offline
Valued Contributor

Joined: Sun Sep 04, 2016 8:07 am
Posts: 125
Thanks offimatrix, egg yolk amber is a first for me, that's definitely the most opaque amber I've ever seen.

Maybe Barbra could try the rub test on the piece and see if there is any odor.

Thanks, Jim


Top
 Profile  
Reply with quote  
 Post subject: Re: Mystery stone
PostPosted: Mon Jun 17, 2019 9:23 am 
Offline
Gold Member

Joined: Wed Jan 23, 2013 5:29 pm
Posts: 1015
Location: Paris
Actually, most baltic amber is opaque before it is heated to make it translucent.

And Stephen, I don't think, either, 2 of the 3 pictures posted by Offimatrix are 1/ jasper 2/ amber.


Top
 Profile  
Reply with quote  
 Post subject: Re: Mystery stone
PostPosted: Mon Jun 17, 2019 12:18 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 19856
Location: San Francisco
Quote:
Maybe Barbra could try the rub test on the piece and see if there is any odor.

Thank you, JCD for your confidence in my nose...... cough cough.

Couple things could be done.
I hope the guy who sent me the email is following the thread.
Hot point, as mentioned earlier, would seperate from plastics or stone.

A good rub might generate some diagnostic piezoelectricity.
Rub, rub rub with wool, silk or cotton and see if the unknown attracts small bits of ashes or paper cut into wee bits.

Wikipedia wrote:
Piezoelectricity is the electric charge that accumulates in certain solid materials (such as crystals, certain ceramics, and biological matter such as bone, DNA and various proteins)in response to applied mechanical stress. The word piezoelectricity means electricity resulting from pressure and latent heat. It is derived from the Greek word πιέζειν; piezein, which means to squeeze or press, and ἤλεκτρον ēlektron, which means amber, an ancient source of electric charge. French physicists Jacques and Pierre Curie discovered piezoelectricity in 1880.


Top
 Profile  
Reply with quote  
 Post subject: Re: Mystery stone
PostPosted: Mon Jun 17, 2019 3:31 pm 
Offline
Gold Member

Joined: Wed Jan 23, 2013 5:29 pm
Posts: 1015
Location: Paris
Sure, but many plastics have the same property.


Top
 Profile  
Reply with quote  
 Post subject: Re: Mystery stone
PostPosted: Wed Jun 19, 2019 2:28 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 19856
Location: San Francisco
A hot point would seperate plastic from pine sap.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 14 posts ] 

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 0 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