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Hardscape womble

Hi all,

If it really does have a slightly metallic sheen? I think it might "slag" <"from metal smelting"> (possibly zinc (Zn), lead (Pb) or copper (Cu)).

cheers Darrel
I don't think it is, based on where I've collected it from. The sheen is 'oil' that was on it (which isn't oil...). Anyway.
 
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