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Copper Slag
This stone is older than it looks. Send it to someone five minutes away.
Just found Copper Slag in Black Castle.
18th Century slag, quarried at Severn-Wye Valleys. Nearest stop: Bristol Temple Meads.
This stone is older than it looks — worth five minutes if you're nearby.
https://www.londonpavementgeology.co.uk/location/5631-black-castle/
The closest other recorded buildings.
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