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Some beautiful obsidian like rocks
  
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sprinklerdude




Joined: 19 Oct 2021
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PostPosted: Oct 20, 2021 08:23    Post subject: Some beautiful obsidian like rocks  

Greetings Internet forum users. Our attention is the most valuable commodity there is (in my opinion), thanks in advance for sharing yours with me.

I recently got these two pieces from a customer, they were used in landscaping.
I haven't been able to find pictures of anything like them.

I don't know much about geology but I work with the ground and have a pretty nice rock collection even including other obsidian but I have never seen anything like either of these.

The small one weighs about 20 lbs and the big one is over 50
The one I call "root beer' color lets some light through the brown and
so does the red one.
The red one has orange streaks and a few purple "flakes" here and there and some crystal formation on it too.

Both are glass-like, the big one is about 13" X 9".

I'd really like to know where they come from, I don't think they came from the same place and I didn't get any useful info from the guy I got them from.
I plan on displaying them indoors, I like rocks.



Obsidian rockies.jpg
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Unknown obsidian like stones
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Obsidian rockies.jpg


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Matt_Zukowski
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PostPosted: Oct 20, 2021 08:48    Post subject: Re: Some beautiful obsidian like rocks  

These are probably glass slag.
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sprinklerdude




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PostPosted: Oct 20, 2021 09:00    Post subject: Re: Some beautiful obsidian like rocks  

As in artificial? I wondered that because of the color. The red one has some crystal stuff on it.
looks like you could make some arrowheads with it either way in a pinch.
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James Catmur
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PostPosted: Oct 20, 2021 09:47    Post subject: Re: Some beautiful obsidian like rocks  

I tend to agree, glass slag of some type.
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R Saunders




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PostPosted: Oct 20, 2021 10:24    Post subject: Re: Some beautiful obsidian like rocks  

Many USA glass factories would dispose of the left over glass in the furnaces when they changed colors or closed up shop, or had to repair a cracked furnace. I have seen especially Fenton glass slag/left over glass for sale at rock shops.
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SteveB




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PostPosted: Oct 20, 2021 15:16    Post subject: Re: Some beautiful obsidian like rocks  

Waste glass for sure, not even stabilised, would not be able to make arrowheads by knapping.
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sprinklerdude




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PostPosted: Oct 21, 2021 07:00    Post subject: Re: Some beautiful obsidian like rocks  

Thanks, that's got to be what it is, I looked up slag glass and it checks out, it's even got bubbles in the red one, I learned that another piece that I have is slag glass too and not obsidian, it's just black/dark brown and baseball sized but has bubbles.
I will stick around here and learn more about rocks for sure and maybe even post something else.
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