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349 Views 4 Replies Last post: Jun 23, 2013 10:18 PM by Tabfish RSS
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Jun 23, 2013 7:51 AM

Id Please ?

id1 (2).jpg

 

each about 2cm long - would love to know what they are ...

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    Jun 23, 2013 11:58 AM (in response to GillyB)
    Re: Id Please ?

    Gilly,

     

    They are amorphous or micro-/cryptocrystalline; that is evident from the (albeit tiny) conchoidal fractures.

    That makes flint or chert a possibility, but the clarity of the clear parts rules them out. Most likely they are glass. But glass can be natural, eg. obsidian, or man-made. I don't think it is obsidian, but it would be useful to know where you collected the pieces, as an aid to ruling obsidian in or out.

     

    While I await your clarification on that, I will suggest they are pieces of glass waste.

     

    The clearer parts would have been relatively internal to larger pieces your bits broke off from, and being internal has prevented those parts from devitrifying. Exposure to the atmosphere and/or soil has allowed outer areas to change composition (structurally if not chemically), losing its glassiness - ie. devitrification.

    Any shapes you see are incidental, not fossil.

     

    Maybe there were glassworks in the area?

    However, that does not necessarily follow, as waste from glassworks and other industries can be transported far afield and used in road building and other ways.

     

    Mike

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    Jun 23, 2013 10:18 PM (in response to GillyB)
    Re: Id Please ?

    Hello GillyB

    I have seen this material several times along the Holderness coast but it has usually been used as hardcore in car parks and on roads.

    It is blast furnace slag.

     

    Tabfish

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