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500 Views 4 Replies Last post: Mar 17, 2014 9:54 PM by Tabfish RSS
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Mar 16, 2014 9:41 PM

Does anyone know what this is please?

I found this today while digging over my allotment in Kent.  It appears to have a crystaline structure and weighs 11 grams.  The "core" underneath appears to be orange like rust but it is not metallic.  The surface is reflective and dark grey like haematite. Can anyone help please? Thanks John.

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    Mar 16, 2014 9:58 PM (in response to John)
    Re: Does anyone know what this is please?

    John,

     

    Good photos.

    It is a marcasite nodule, and a rather nice one.

    Here's one similar to yours but more worn

    - http://www.nhm.ac.uk/natureplus/message/36301

    (the link within that discussion not longer works, BTW)

     

    Mike

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        Mar 17, 2014 8:08 PM (in response to John)
        Re: Does anyone know what this is please?

        John,

         

        Yes, these iron minerals have lots of interest.

        Bear in mind there are variants, such as arsenopyrite (more silvery) and chalcopyrite (more golden). Also Google bornite for some stunning metallic blues-purples. I'm not sure about the use of those in jewellery; I guess I'd steer clear of arsenopyrite - with the arsenic connection.

         

        In general, as a matter of good practice, it would be preferable if you posted links to related info rather than copy and pasting it. I know it is easier to read if pasted, but there are issues of infringements of rights and general courtesy. When posting a link to an image, also include a link to the page where you found it. That makes it easier for people to follow-up, and maybe to see a caption or other text orphaned from the image on its own.

         

        I hope you find other buried treasure on your allotment, or elsewhere.

         

        Mike

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