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2182 Views 2 Replies Last post: Oct 13, 2012 2:54 PM by Ambler RSS
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Oct 6, 2012 11:21 PM

Blue stone

1210 Oct 001 BlueStoneEx ForestOfDean.JPG1210 Oct 003 BlueStoneEx ForestOfDean.JPG

Can anybody help identify this rock/mineral please?  Found in Forest of Dean on an old railway track. Morphology like a piece of flint. The blue colour is fairly true to life. The blue feels like very hard plastic. I'm not convinced it is naturally occurring and may be a piece of slag or bi-product of an industrial process used as hard core on railway.

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    Oct 13, 2012 9:51 AM (in response to Ambler)
    Re: Blue stone


    it looks to me to definatly be a chert nodule, the waxy feel of the 'hard plastic' and distinctive curves on the fracture are a give away.

    flint, chert, chalcedony, quartz are all broardly the same stuff; silica dioxide. but the mineral can crystalise in many differing forms and including other trace minerals which effect the colour.

    agates opals obsidian rose-quartz are all based on silica dioxide, and they have a huge range of colours and shapes.


    i would hazard a guess that this could be classified as a "blue chalcedony"



    hope that helps

    happy hunting

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