Can anyone identify this in carbon black limestone please?

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Offline Steve123

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I am a landscape gardener and recently ordered some Carbon black limestone for a patio I was Laying at home. I opened the pallet and whilst laying a stone it broke and this is how it looks inside. Can anyone tell me what it is please? It wont stick to a magnet but it is quite hard. Thanks, any ideas appreciated. Trying to upload a picture.

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Offline Bill S

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Hi Steve, good luck with the picture upload; I'm looking forward to seeing it.  In the meantime, if you could get a better idea of the hardness - compare to copper coin, knife blade etc.  Also, if you can scratch it with a knife, what colour is the streak?  Does it react with acid?  These things would help
There never was nothing.

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Offline RD

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Offline Bass

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Don't forget chert layers, or metallic minerals deposited in a reducing  (carbon rich) environment.
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