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Markfieldite
This stone is older than it looks. Send it to someone five minutes away.
Just found Markfieldite in Upper Woburn Place.
650-540 Ma diorite, quarried at Charnwood, Leicestershire, England, UK. Nearest stop: Euston LU.
This stone is older than it looks — worth five minutes if you're nearby.
https://www.londonpavementgeology.co.uk/location/1893-upper-woburn-place/
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