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Emerald or Glass?

Posted by Stanley Craig  
Emerald or Glass?
January 31, 2012 10:52PM
This is my first post in this forum, so please bear with me.
I was a contractor for 20 and I did some work for an older gentleman. He had traveled all over the world and always brought back rocks. I found one very interesting and he gave it to me. It was almost white and was a fairly soft material that kept falling a apart. I took it home and set it in a flower bed. Well a few years later I noticed something green in the middle when the white substance had weathered away. I just thought it to be a chunk of glass. But what was the white material? It had a consistency of thick toothpaste or something.
The green glass was about a small baseball size. I cut it on my rock saw and found a lot of air bubbles in it. Well I got to thinking that it maybe an emerald. Since it did come from South or Central America. I watched the show about the Bahia emerald and it got me thinking about my green glass. Several years ago I had a vibrating polisher with carpet and I guess tin oxide in it. I had placed this green glass in that and all I came up with is tin oxide stuck to it, just like all the other rocks that I tried to polish. So I went out and found the green glass and tried to take off some of the tin oxide by using a grinder with 120 aluminum oxide grit on it. I got some of it off and then took pictures. It did polish some of the green glass this way. I wouldn't think it would do that if it was glass. So I ended up here and I also emailed a guy named Jeff, one place said "ask Jeff', so I did.
Does anybody have any idea of what I have. The piece pictured weighs 75 grams. Thanks for any info.
open | download - EG 1-1.JPG (589.5 KB)
open | download - EG 1-2.JPG (472 KB)
open | download - EG 1-3.JPG (475 KB)
avatar Re: Emerald or Glass?
January 31, 2012 11:19PM
It's glass. Natural emeralds do not contain bubbles of that size.
avatar Re: Emerald or Glass?
January 31, 2012 11:27PM
glass or kryptonite...
seriously now, Stan, try to scratch it with a quartz. If you can, is glass.

Edited 1 time(s). Last edit at 01/31/2012 11:37PM by Jose Zendrera.
Re: Emerald or Glass?
January 31, 2012 11:31PM
Lol Jose.

Yes, it's a perfect example of how not to make African Moldavite winking smiley

All jokes aside though, it's definitely glass.
avatar Re: Emerald or Glass?
February 01, 2012 12:53AM
First off; welcome to Mindat, Stanley, and thanks for registering!!
And yes, your specimen is green glass....

Edited 1 time(s). Last edit at 02/01/2012 12:54AM by Paul Brandes.
Re: Emerald or Glass?
February 01, 2012 01:21AM
I figured it was but I had to try. I wonder what the white material was that was around it. Strange. Thanks for the replies
Re: Emerald or Glass?
February 22, 2012 07:47PM
Found a few very small emeralds @ Emerald City on our trip to NC last year. Cost $10.00 to search.
I did all the 'finding'. :)
open | download - 2012-02-23 001.JPG (855.5 KB)
Re: Emerald or Glass?
February 27, 2012 02:44AM
Nice finds Diann smiling smiley

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