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biorapter321
Joined: 20 Feb 2022
Posts: 3
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 Posted: Feb 20, 2022 17:31 Post subject: Help identify strange rock sample |
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Does anyone know what this is, its looks a lot like flint except for the blue colour. Thanks in advance.
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alfredo
Site Admin
Joined: 30 Jan 2008
Posts: 979
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| Posted: Feb 20, 2022 17:43 Post subject: Re: help identify strange rock sample |
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| Artificial glass. Beautiful, but not a mineral.
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biorapter321
Joined: 20 Feb 2022
Posts: 3
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| Posted: Feb 21, 2022 05:40 Post subject: Re: Help identify strange rock sample |
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| Would it still have the white inclusion that you see in flint if it was glass? It really feels like a rock. Thanks
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biorapter321
Joined: 20 Feb 2022
Posts: 3
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| Posted: Feb 21, 2022 06:38 Post subject: Re: Help identify strange rock sample |
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| Could it not be a variety of chalcedony
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Kevin Schofield
Joined: 05 Jan 2018
Posts: 162
Location: Beacon NY
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| Posted: Feb 21, 2022 08:55 Post subject: Re: Help identify strange rock sample |
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| biorapter321 wrote: | | Could it not be a variety of chalcedony |
Glass slag often has inclusions of different colours or even comprises a mix of colours.
This is without any shade of doubt a piece of slag glass.
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Veni, Vidi, Emi |
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B Glassburn
Joined: 13 Sep 2021
Posts: 6
Location: Scottsville, New York
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| Posted: Feb 21, 2022 09:19 Post subject: Re: Help identify strange rock sample |
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| Agreed, glass. I do have botch opal from Oregon with a similar bit of blue in it, but nothing like this. Looks like the glass pieces sold at aquarium stores for decor.
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Pete Modreski
Site Admin
Joined: 30 Jul 2007
Posts: 709
Location: Denver, Colorado
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| Posted: Feb 21, 2022 14:05 Post subject: Re: Help identify strange rock sample |
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'Tis glass, alas!
Some intentionally produced glass for decorative use, or industrial slag glass, may have unmelted chunks of limestone or quartzite or flint in it, that haven't all dissolved in the molten glass. Or, if it was cooled very slowly, it may develop white crystallizing patches of a mineral (such as cristobalite), just like one finds in snowflake obsidian.
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