I found these four rock like items in a field. I posted it on a metal detecting group on fb and it stirred quite a debate. From the comments I gathered it must be coke. Researching coke on the internet shows that coke is a grey color. Has anyone here found the likes of this before. It rings a stable 40-41 on the AT Pro and the pin pointer screams at an inch. It feels and weighs like coal, but does not give off even a bit of black when rubbed or scratched on white paper. If coal or coke, could it be that ferrous to ring a stable 40? If so, why? I have my theories but would enjoy any input.
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