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Quartz
This stone is older than it looks. Send it to someone five minutes away.
Just found Quartz in Madog Street Wall.
Palaeozoic mineral, quarried at Snowdonia, North Wales. Nearest stop: Porthmadog.
This stone is older than it looks — worth five minutes if you're nearby.
https://www.londonpavementgeology.co.uk/location/3666-madog-street-wall/
The closest other recorded buildings.
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