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12 Dec-02:50:42 Re: the collection of pierre and riana joubert (Pierre Joubert)
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Can someone tell me what this is please.
  
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Siarajane




Joined: 29 May 2018
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PostPosted: May 29, 2018 18:00    Post subject: Can someone tell me what this is please.  

I kinda thought this might be a piece of coal but I’m not sure. It’s about 2 1/2 inches tall. It’s black on the bottom. Then turns into a blueish green. It’s seems to have some algae coated on the outside. I tried brushing it off but it won’t come off. When it’s wet it’s really pretty. The picture included is of when it’s wet.


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Bob Harman




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PostPosted: May 29, 2018 18:12    Post subject: Re: Can someone tell me what this is please.  

It is a piece of glass slag. Not natural. BOB
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Josele




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PostPosted: May 31, 2018 09:23    Post subject: Re: Can someone tell me what this is please.  

Bubbles and color distribution in flow lines show up that it is a not-natural glass.
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alanbartlett




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PostPosted: May 31, 2018 09:39    Post subject: Re: Can someone tell me what this is please.  

Not so far from me in Sheffield, UK there is any amount of this stuff lying around in the woods where old metal smelters were - 17/1800's - and in varying shades of green and occasionally blue. It is known locally as industrial slag - incidentally it takes a nice polish if you can keep away from the numerous air bubbles!
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