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375 Views 5 Replies Last post: Aug 10, 2014 6:55 AM by MikeHardman RSS
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Aug 9, 2014 6:04 PM

Rock or fossil or alien egg? Please help

I found this item on the kent coast and i have no idea what it is. If anyone could shed some light on it id be very greatful

 

Many thanks

paul

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    Aug 9, 2014 9:09 PM (in response to Pjc250)
    Re: Rock or fossil or alien egg? Please help

    Good object!

    I have next-to-no ideas - it looks a bit like a septarian nodule, a bit like a trace fossil, a bit like net veining.

     

    Is the pale material chalk?

    Is the dark material mineral or metal (test to see if it has any attraction with a magnet, test to see if it conducts electricity (be sensible)).

    Was there just the one piece? If not, what were the other pieces like?

     

    Mike

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        Aug 9, 2014 11:19 PM (in response to Pjc250)
        Re: Rock or fossil or alien egg? Please help

        Great find, I would have taken this home as well, very intersting.

        I think the veins in the matrix are made from iron pyrites and the matrix is softer than the  pyritic veins, so they stand out as harder than the matrix.

        I agree with Mike when he say's it looks a bit like a septarian nodule but with pyritic veins instead of quarts vains.

         

        Tabfish

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            Aug 10, 2014 6:55 AM (in response to Pjc250)
            Re: Rock or fossil or alien egg? Please help

            Pyrite will register on a metal detector only on very low frequency, maybe (judging by what I found through Googling). It could be pyrite veining. I'm tempted to suggest you try scratch testing it, but it is clearly not made of large individual crystals, so the result could be ambiguous (you could seem to be scratching it while actually breaking off tiny crystals instead).

            The veins are clearly harder than the host rock, and maybe why we see this lump at all is just a chance higher-concentration of veins, hence greater resistance to erosion.

             

            Mike

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