Amphibolite with folded veins of quartz, feldspar and hornblende. St Paul's underground station, London. @ImperialRSM http://pic.twitter.com/xXILdEaNhM
— The Rock Library (@Rock_Library) June 17, 2017
via Twitter https://twitter.com/Rock_Library
June 18, 2017 at 01:24AM
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