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 Post subject: Cobalt Spinel's strange inclusion
PostPosted: Wed Feb 25, 2009 3:06 am 
Start things off by saying the inclusions are in a 1.25 ct Cobalt spinel- I think from Vietnam but could be from anywhere (though probably Vietnam).

It's a weird one... Yellow squigglys, like angel-hair pasta. Color is kinda like banana peel yellow, and opaque.
Not really noticeable by eye but very clear with 10X.

Any ideas what this could be?

Thanks!

David


Last edited by Coyotegem on Mon Mar 09, 2009 9:53 pm, edited 1 time in total.

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PostPosted: Wed Feb 25, 2009 11:40 pm 
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David...

does it look like this?
Image
By ux4, shot with CYBERSHOT at 2009-02-25

If it does, here is a close up that may help in identification.
Image
By ux4, shot with CYBERSHOT at 2009-02-25

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PostPosted: Thu Feb 26, 2009 12:06 am 
Neato!

No nothing like the mine but I'm really impressed anyway. Thanks for the effort. At first I thought your pics were of two different inclusions, and then wow, it's just higher magnification :shock:

I know that a written description is very difficult to identify so I'll try to draw something up in PS soon.


The inclusion definitely has the look of opaque yellow twine/rope/fibers.

Hey! if anyone in U.S. would be willing to photograph it for me- I'll send them the stone? (but I want it back, please)


David


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PostPosted: Thu Feb 26, 2009 12:15 am 
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Coyotegem wrote:

Hey! if anyone in U.S. would be willing to photograph it for me- I'll send them the stone? (but I want it back, please)


I would love to shoot it David!

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PostPosted: Thu Feb 26, 2009 12:19 am 
Very Cool!!! Thanks. I'll send u a quick PM

David


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 Post subject:
PostPosted: Mon Mar 09, 2009 9:39 pm 
Ux4 was so kind to photograph this stone for me!
Image
1.25ct Cobalt Spinel

Any guesses as to what this mineral inclusion is?

David


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PostPosted: Tue Mar 10, 2009 8:57 pm 
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David...

see : http://66.163.168.225/babelfish/transla ... nelle%2525



The inclusion is described but not identified. BUT, when you find this thype you hqve a confirmation thet the stone is not synthetic, In addition your stone has octahedrals which are common to spinels.


compare to yours, David:
Image
By ux4, shot with CYBERSHOT at 2009-03-10 Wild M400

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Last edited by Ux4 on Tue Mar 10, 2009 11:41 pm, edited 1 time in total.

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PostPosted: Tue Mar 10, 2009 10:24 pm 
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Wow that babelfish translation was much better than I would have expected!
Thanks for that link.

The pictures on the other hand are exactly as GOOD as I expected.
The list membership will pardon me if I feel a little proud of John and Tim's beautiful recent pix, since I had a little to do with them getting those scopes. :wink:

John I see you are starting to get it really zeroed in.


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PostPosted: Tue Mar 10, 2009 11:14 pm 
John, thanks for all the time you spent on my stone and all the other pics! I may post another one with the negative crystal... yup looks just like a negative spinel, how odd.

Amazing that you also have a cobaltiferous spinel with the same type and color inclusions :smt023 wonder if our's are cousins? Do you know where yours came from?

Inclusion photo- Geminterest.com
Just like when looking in my stone- this picture gives me the creeps!

David


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PostPosted: Tue Mar 10, 2009 11:27 pm 
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.a

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Last edited by Ux4 on Tue Mar 10, 2009 11:40 pm, edited 1 time in total.

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PostPosted: Tue Mar 10, 2009 11:37 pm 
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G4Lab wrote:
The list membership will pardon me if I feel a little proud of John and Tim's beautiful recent pix, since I had a little to do with them getting those scopes. :wink:

John I see you are starting to get it really zeroed in.


Yup, Gene: you sold me! No buyer's remorse here. Did you see the pics of the system in gem equipment? You can see what I mean when I say "mint".

I'm trying to shorten the learning curve; bit learning the new techniques is fun. Thanks.


YIKES DAVID! That pic was of the inclusion in YOUR stone. However there are some aspects in the first pic posted above that are similat to the fibrous inclusions in yours. That is from a mauve stone.

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PostPosted: Tue Mar 10, 2009 11:54 pm 
Ahhh, I see :D got me confused when you posted the last picture that said 'compare to mine'... thought you had one too! (even though when you sent it last night I thought it was a picture of mine- see? :lol:)

Now that's an awesome picture- I'm definitely gonna save it.

Are you able to tell how deep it is from the pavilion facet? I'm trying to gauge if I can reasonably remove it by recutting.

Thanks again John, hey do you have a cobalt spinel? thought I read it in a thread here.

David


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PostPosted: Wed Mar 11, 2009 12:35 am 
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Coyotegem wrote:
Ahhh, I see :D got me confused when you posted the last picture that said 'compare to mine'... thought you had one too! (even though when you sent it last night I thought it was a picture of mine- see? :lol:)

Now that's an awesome picture- I'm definitely gonna save it.

Are you able to tell how deep it is from the pavilion facet? I'm trying to gauge if I can reasonably remove it by recutting.

Thanks again John, hey do you have a cobalt spinel? thought I read it in a thread here.

David


It's deep enough that you would loose a lot of weight. It is just barely visible in the pavilion under bright light. I cannot see it face up. and remember, it's proof that you have a natural stone.

I do have a nice one. I'll see if I can find a link to it.

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PostPosted: Wed Mar 11, 2009 12:42 am 
In that case, do you have an idea how deep it is? so I know how much material I can remove before reaching the inclusion... seems I'm kinda stuck either way :-(

Yes please post a link :-)


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PostPosted: Wed Mar 11, 2009 12:53 am 
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Coyotegem wrote:
In that case, do you have an idea how deep it is? so I know how much material I can remove before reaching the inclusion... seems I'm kinda stuck either way :-(

Yes please post a link :-)



I would never consider cutting that inclusion out. I would guess it's .2 to .3 mm in, but that is a 1.25 stone. YOU are the cutter.

Cobalt Spinel Inclusions:
http://gemologyonline.com/JMH/JMH.html

Cobalt Spinel - eye clean:
http://img59.imageshack.us/img59/7692/mcomp13xq.jpg

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CenSat Enterprises


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