Zoned tourmaline in a altered Granite (sericitization) from St Austell, Cornwall, England. PPL (plane polarised light) image, 10x (Field of view 7 mm). #alexstrekeisen #geology #thinsection #Cornwall pic.twitter.com/MFO5ZlcS9M
— Alexstrekeisen (@alexstrekeisen) March 13, 2021
via Twitter https://twitter.com/alexstrekeisen
March 13, 2021 at 11:42PM
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