GemologyOnline.com
https://gemologyonline.com/Forum/phpBB2/

Is this exactly glass?
https://gemologyonline.com/Forum/phpBB2/viewtopic.php?f=100&t=25768
Page 1 of 1

Author:  bibobibo [ Sat Jul 11, 2020 5:47 am ]
Post subject:  Is this exactly glass?

It has very beautiful colors, can change color according to the viewing angle, hardness> 6.5 (steel nail don't scratch it) but <=7 (quartz made it scratched).,
I used a 150x magnification hand-held microscope to take some photos. I think it has growth lines, melt inclusions (not bubbles)...



Attachments:
20200519_044829.jpg
20200519_044829.jpg [ 3.06 MiB | Viewed 13613 times ]
20200519_024107.jpg
20200519_024107.jpg [ 2.8 MiB | Viewed 13613 times ]
20200519_024846.jpg
20200519_024846.jpg [ 2.09 MiB | Viewed 13613 times ]
IMG-1939.JPG
IMG-1939.JPG [ 1.14 MiB | Viewed 13613 times ]

Author:  cascaillou [ Sat Aug 29, 2020 5:54 pm ]
Post subject:  Re: Is this exactly glass?

Those many shiny round inclusions which we can see all along the video look like bubbles to me

Author:  1bwana1 [ Sat Aug 29, 2020 6:19 pm ]
Post subject:  Re: Is this exactly glass?

Sure looks like glass to me.

If you have a nice sized quartz crystal place it and the blue sample on a table.

Leave them without touching them for about an hour so they can adjust to room temperature.

Make sure they are not in the direct line of air conditioner.

Pick up the quartz crystal and touch it to your cheek. It should be cold.

Now pick up the blue sample and touch it to your cheek. If it is not as cold as the quartz was, it is likely glass.

This works because glass is amorphous, while quartz has a crystal structure a conducts away the heat much better than glass.

Give it a try and report back.

Author:  bibobibo [ Sat Sep 05, 2020 10:53 am ]
Post subject:  Re: Is this exactly glass?

Thank so much for answering me!

By testing the temperature of the specimen when it is placed on the lips (cheeks) or burned a few strands of hair, the results suggest that it may be a stone.

There are many things inside this specimen, many "yellow eggs", some are broken, some contain something inside it, come in many colors and shapes: blue, red, pink, violet, green ... pyramid, hexagon. A bubble (like pic. 3) is probably glass, because the other bubble is on the surface of the specimen but doesn't "break", if look closely, can see smaller objects in the bubble. May be there is a lot of liquid in this specimen.
Perhaps it has the structure:
- It has graining/ growth lines.
- A "disk"(pic. 2), a "bubble" (pic. 3) and "fingerprint" (pic. 1) are always close together.
- The color when viewed according to the c-axis is always different when looking from another angle: green is slightly yellow in sunlight, even colorless under led lights.

It is unusual that I picked it up from the ground in my garden, where there has never been a record of any gem or natural glass. I also can't find anything else that seems to have something to do with it.

Attachments:
File comment: a bubble
20200519_031053.jpg
20200519_031053.jpg [ 2.85 MiB | Viewed 11995 times ]
File comment: A "disk"(pic. 2), a "bubble" (pic. 3) and "fingerprint" (pic. 1) are always close together.
20200519_024906.jpg
20200519_024906.jpg [ 1.76 MiB | Viewed 11995 times ]
File comment: Some yellow eggs contain something inside it
20200519_045754.jpg
20200519_045754.jpg [ 2.65 MiB | Viewed 11995 times ]
File comment: Some yellow eggs contain something inside it
IMG20200324225020.jpg
IMG20200324225020.jpg [ 1.24 MiB | Viewed 11995 times ]
File comment: Some yellow eggs contain something inside it
IMG20200324225252.jpg
IMG20200324225252.jpg [ 1.33 MiB | Viewed 11995 times ]

Author:  Barbra Voltaire, FGG [ Sun Sep 06, 2020 5:11 pm ]
Post subject:  Re: Is this exactly glass?

Quote:
By testing the temperature of the specimen when it is placed on the lips (cheeks) or burned a few strands of hair, the results suggest that it may be a stone.


May I suggest that the results are likely "user error".

Author:  1bwana1 [ Sun Sep 06, 2020 6:43 pm ]
Post subject:  Re: Is this exactly glass?

bibobibo wrote:
Thank so much for answering me!

By testing the temperature of the specimen when it is placed on the lips (cheeks) or burned a few strands of hair, the results suggest that it may be a stone.



What the heck does burned a few strands of hair mean. Where did that come from?


That is not a stone. Glass often comes from peoples back yard....

Author:  Barbra Voltaire, FGG [ Sun Sep 06, 2020 8:00 pm ]
Post subject:  Re: Is this exactly glass?

Hair idea.
That is an old trick used in Asia to seperate jade from imposters.
Wrap a stone in a hair and see if you can light it on fire.
Originaly, it was believed that if it was truly jade, the hair would not burn.

As it turns out, according to Dick Hughes who apparently got fooled a couple of times using this method, if one wraps a hair around anything that is a mineral or rock (not glass, organic stuff or plastic) it should not burn.

I have not used this test myself as things never turn out well when I'm using matches.

Author:  1bwana1 [ Sun Sep 06, 2020 10:17 pm ]
Post subject:  Re: Is this exactly glass?

Barbra Voltaire, FGG wrote:
Hair idea.
That is an old trick used in Asia to seperate jade from imposters.
Wrap a stone in a hair and see if you can light it on fire.
Originaly, it was believed that if it was truly jade, the hair would not burn.

As it turns out, according to Dick Hughes who apparently got fooled a couple of times using this method, if one wraps a hair around anything that is a mineral or rock (not glass, organic stuff or plastic) it should not burn.

I have not used this test myself as things never turn out well when I'm using matches.


I must have napped during that class at both University, and the GIA.

Author:  Barbra Voltaire, FGG [ Mon Sep 07, 2020 1:06 pm ]
Post subject:  Re: Is this exactly glass?

Well, now that you know, you can add it to your testing routine. :wink:



Please be aware that this post is sarcastic. This test will NOT identify jade.
It is my understanding that a hair will not burn on a mineral or rock but it will on glass, plastics etc.
But, as I said, I've never tried it.

Author:  1bwana1 [ Mon Sep 07, 2020 3:06 pm ]
Post subject:  Re: Is this exactly glass?

I just can't see myself listing the burning hair test on one of my reports. Like they say, an education ruins people, and closes their minds.

Author:  Barbra Voltaire, FGG [ Mon Sep 07, 2020 4:17 pm ]
Post subject:  Re: Is this exactly glass?

=D> That really made me LOL

Page 1 of 1 All times are UTC - 4 hours
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
http://www.phpbb.com/