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Imperial Porphyry
This stone is older than it looks. Send it to someone five minutes away.
Just found Imperial Porphyry in 70-74 Cannon Street.
630-592 Ma andesite porphyry, quarried at Hurghada, Eastern Desert, Egypt. Nearest stop: Cannon Street LU.
This stone is older than it looks — worth five minutes if you're nearby.
https://www.londonpavementgeology.co.uk/location/954-70-74-cannon-street/
The closest other recorded buildings.
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