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Slag glass probably?
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Laura Overstreet




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PostPosted: Mar 16, 2019 17:27    Post subject: Slag glass probably?  

I found my 'rock' last night and found the pieces I broke off it this morning. I have had this piece for about 14 years. My little brother was working in a tourist shop selling mostly arrowheads (fake) and tie dyed t-shirts; we stopped by to say hello to him but he wasn't working that day. This piece was on the floor almost under a table. I asked the manager how much it was and she said I could have it, she was tired of tripping over it. She brought me another rock to take home that I didn't really want, big brown river rock, but took since she was being so generous. I didn't think too much or really care too much about what it was because I thought it was glass or maybe marble (but it isn't like any marble I've touched before). The color made me think it wasn't natural. It sat in the corner, on the floor, in my kitchen for 14 years.

The images were hard to shoot because it refracts the light - closest thing I can think of to how it looks is cold banana pudding. It weighs five pounds, is sitting on a 10 inch dinner plate, is 7x6x3 at the widest points, is both sharp and smooth, it breaks like baked rock - sharp but no flakes/splinters. I put vinegar on it -nothing, it scratches anything it lays on. And......... it glows under a black light -a lot.



DSCF2810.JPG
 Mineral: Unknown
 Description:
Unknown
7x6x3
There are four 'parts' to my piece: The yellow, the reddish brown, white patches that look like when you rip duck tape off of glass, and in only a couple of parts a deep black inclusion in the yellow.
 Viewed:  940 Time(s)

DSCF2810.JPG


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Catahoula




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PostPosted: Mar 16, 2019 17:56    Post subject: Re: Slag glass probably?  

I vote for the banana pudding....
It looks like much of the "potch" or common opal I am finding. Love the racing stripe.
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Laura Overstreet




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PostPosted: Mar 16, 2019 17:59    Post subject: Re: Slag glass probably?  

I forgot to include my light image.


DSCF2854.JPG
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DSCF2854.JPG


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Laura Overstreet




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PostPosted: Mar 16, 2019 18:03    Post subject: Re: Slag glass probably?  

I included many images but I only see one. They were there in the preview. I hope I'm not including them twice.


DSCF2779.JPG
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Laura Overstreet




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PostPosted: Mar 16, 2019 18:05    Post subject: Re: Slag glass probably?  

Other side


DSCF2809.JPG
 Mineral: unknown
 Dimensions: 7x6x3
 Description:
Unknown
7x6x3
Other side
 Viewed:  912 Time(s)

DSCF2809.JPG


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Laura Overstreet




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PostPosted: Mar 16, 2019 18:06    Post subject: Re: Slag glass probably?  

Black light


DSCF2851.JPG
 Mineral: unknown
 Description:
Unknown
7x6x3
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DSCF2851.JPG


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Laura Overstreet




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PostPosted: Mar 16, 2019 18:08    Post subject: Re: Slag glass probably?  

Better view of reddish color


DSCF2821.JPG
 Mineral: unknown
 Description:
Unknown
7x6x3
 Viewed:  906 Time(s)

DSCF2821.JPG


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Laura Overstreet




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PostPosted: Mar 16, 2019 18:10    Post subject: Re: Slag glass probably?  

Letting the light through.


DSCF2825.JPG
 Mineral: unknown
 Description:
unknown
2x2x1 1/12
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DSCF2825.JPG


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Laura Overstreet




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PostPosted: Mar 16, 2019 18:12    Post subject: Re: Slag glass probably?  

Flat white patches.


DSCF2831.JPG
 Mineral: unknown
 Description:
unknown
7x6x3
 Viewed:  898 Time(s)

DSCF2831.JPG


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Catahoula




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PostPosted: Mar 16, 2019 18:22    Post subject: Re: Slag glass probably?  

swiss-cheesium?
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Laura Overstreet




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PostPosted: Mar 16, 2019 18:27    Post subject: Re: Slag glass probably?  

That is funny because my daughter called it 'the cheese rock' when she was little!
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Firmo Espinar
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PostPosted: Mar 16, 2019 18:55    Post subject: Re: Slag glass probably?  

Welcome to FMF Laura.

You give us some comments and pictures but please for the following posts read and use: What is it? - Where is it from?

Also you can read this thread to avoid overloading the users posts box:

How to add multiple photos to a Post

And place your comments in the description of the photograph.

It seems to be chert but I guess the many bubbles tell us it’s glass slag.

Regards.
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Bob Harman




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PostPosted: Mar 16, 2019 18:57    Post subject: Re: Slag glass probably?  

As Franjungle says, and we agree. SLAG GLASS! Not natural. BOB
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Laura Overstreet




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PostPosted: Mar 16, 2019 19:05    Post subject: Re: Slag glass probably?  

Thank you for the link. I am not new. I have been a member for a long time. I have only posted twice. I added all my images in the body with tags but they didn't show when I posted. I also read how to add pictures but the link said they needed to be off site/hosted somewhere else.
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Laura Overstreet




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PostPosted: Mar 16, 2019 19:09    Post subject: Re: Slag glass probably?  

Bob: I don't care really if it is glass or opal. I had never heard of plain opal before and want to learn more about it. Opal is also my birth stone. If it is slag why does it fluoresce under black light? I thought only old time glass would have that effect.
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Laura Overstreet




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PostPosted: Mar 16, 2019 20:03    Post subject: Re: Slag glass probably?  

Bob, thank you but never mind.

I checked the list sent by Franjungle and am not sure what I did wrong. I added photos, a locality which I don't know, the matrix is smooth and sharp but I thought matrix mostly applied to crystals, I added the color and the luster. I saw my pictures all in a line and all tagged in my preview. I read the info in how to post. But they didn't show when I actually posted. It took me over 25 minutes to add them the first time. I tested as much as I could.
I did place my place comments in the description of the photograph the first time.

I can't see how to delete but I was excited to learn more and now wish I hadn't shared.

I have been a member for a long time. I have learned a lot from what people share. I think more people would share if not for worry over making a mistake and getting a message like this.

I did read 'how to post' in the hopes of not making a mistake.

* Welcome to FMF Laura.

You give us some comments and pictures but please for the following posts read and use: What is it? - Where is it from?

Also you can read this thread to avoid overloading the users posts box:

How to add multiple photos to a Post

And place your comments in the description of the photograph.

It seems to be chert but I guess the many bubbles tell us it’s glass slag. *

Maybe my piece isn't exciting but I love it. If the unsubscribe button doesn't work for me Franjungle can admin me out.
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Kevin Conroy




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PostPosted: Mar 16, 2019 20:05    Post subject: Re: Slag glass probably?  

Hi Laura,

I also agree that your specimen is slag. The bubbles, along with the swirling patterns and varying color, are characteristic of slag. I think that yours is very aesthetic and the fluorescence is a plus. I know almost nothing about fluorescence so I can't help with any answers about that.

A good place to learn about opal is here: https://www.mindat.org/min-3004.html

Be sure to check out the portion of the page regarding the different varieties! You can also use the links on this page to see opal photos and many of the reported localities where opal was found.

Please let me know if I can be of further help.
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Laura Overstreet




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PostPosted: Mar 16, 2019 20:07    Post subject: Re: Slag glass probably?  

Thank you Kevin. Maybe I will see you around a show here in St. Louis sometime. I can't make next Sunday but I might be able to come out on Friday.
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R Saunders




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PostPosted: Mar 17, 2019 06:28    Post subject: Re: Slag glass probably?  

I would consider that it is custard slag from the A. H. Heisey Glass Mfg. Co., Newark Ohio. They made uranium glass cups and pictures. Many company's had glass dumps, for miss formulas. You did not state where it was found and could have been brought there like a worker brought it home.
Bob, past president of W.M.G.C.
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Laura Overstreet




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PostPosted: Mar 18, 2019 09:50    Post subject: Re: Slag glass probably?  

Hello all! I am still here and plan to continue to be a part of the forum hereafter and forever. Firmo was able to change the heading of my post to reflect what this actually is.

I wanted to update on this piece because as you Bob and Kevin suggested, it is slag glass. I thought it was before seeing the image of the plain opal too. They do look very much alike in color, luster, and shape. I thought though, it was modern slag maybe from an art studio. It isn't. It does also resemble chert, as Firmo suggested.

It is depression glass, and from Ohio as you suggested Bob S., but I think it is from the Akro Agate Company. They made two colors called ox blood and lemonade - these two colors match this piece exactly. But isn't just a piece of slag from them - it is the color manna for the glass - more uranium than you would ever find in a piece made by them.

Kevin, I also don't know about minerals that fluoresce. I do though collect depression glass (and like things that glow) and did already know that it was uranium that caused the effect. It is safe to own, most pieces, but it is according to the EPA not safe to eat or drink from. I never researched how much uranium or the how's of it being made until today. Many places cite that it could have been made with as much as 25% uranium to glass mix. Yikes! I don't believe any one really knows how much uranium was used but they used it liberally and I think whatever the max amount to still create glass would be found in many pieces.

So, the reason for my lengthy post here is that this is being sold in many places as chert, plain opal, and others; for both display pieces and lapidary. I too was going to tumble my smaller pieces of glass for facet stones. I do not know what the millrems below mean but I think it is important to NOT WEAR RADIOACTIVE JEWELRY or have these 'rock' pieces in a home until you know the level of radioactivity! I am including an image of this glass cut, being sold as a necklace piece.

The other image shows the glassware sold by Akro Agate - it is mostly clear with a touch of color. These types of glass are mostly safe. They did create more solid pieces but they still have a see through glass look.

This is from a question to the IGS in cutting this type of slag glass in lapidary.

Mr. Donald Clark, CSM IMG of the International Gem Society writes he had 'a plate from the 1930s that is too hot (45 millirems/hr) to ship by the PO or UPS' he continues with 'When I put my “hot dish” under a longwave UV light, it lights up the whole room up with a “Gatorade” greenish-yellow light'. I did think it was odd that my piece had so much 'glow' from so far away holding a very cheap UV light. The image here is of a small depression glass circle (I'm not sure if it is a lid or coaster) and a small chunk of my glass piece under my UV light at about 5 feet above.

The only way to know for sure how much radioactivity a piece has is to use a Geiger counter. If someone bought chert a good way to tell if it is really chert and not depression slag glass would be weight and color. Baking chert makes it lighter for its size - it will have almost a paper feel to it. Slag glass with uranium will be much heavier than its size, as my piece is. There are many gemmy chert's, they have good, bright colors, and you may be able to see through them. But it will not have the transparent look of glass. Having bubbles in a piece would be a good indicator of glass not chert or opal but most of my piece does not have bubbles. I found a post on Mindat, that I can't find again tonight, where Alfredo suggests using a flame on the end of a thin piece to tell if it is glass or natural rock - the glass will melt the rock won't. I don't know if that is safe to do with the depression glass; so if it glows under UV light don't do until until we know for sure.

I don't know if plain opal fluoresces under UV light. I haven't been able to find exact information on this. There are many images of it opal fluorescing on the internet but there is no way to know if it is really opal.

I am not sure how to normalize the links here so the post from Donald Clark can be found at the gemsociety under uranium-glass-safe-to-facet and the EPA information is 3 dot epa dot gov /radtown/antiques html.

I do not have a Geiger counter yet, until then and most likely forever, my 'rock' lives outside. Thank you all for help with this! Laura



radioactive.JPG
 Mineral: slag glass comparison of glow effect under UV light from 5 feet above
 Description:
no locality
Small coaster size and about 1 inch around glass piece
The clearer glass piece has almost no fluorescence.
 Viewed:  426 Time(s)

radioactive.JPG



radioglass.JPG
 Mineral: Depression glass that is mostly clear/cut piece of depression glass
 Description:
no locality
none
The clearer the depression glass, as the dishes above are, the safer to own. But not eat or drink from.
 Viewed:  426 Time(s)

radioglass.JPG


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