Blue fibrous tourmaline (indicolite) crystals in a granulite from Germany. PPL (plane polarised light) Image, 20x (Field of view 1 mm) #alexstrekeisen #geology #thinsection https://t.co/X2ZiHssV2V
— Alexstrekeisen (@alexstrekeisen) Aug 10, 2021
via Twitter https://twitter.com/alexstrekeisen
August 10, 2021 at 09:34PM
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