PPL (plane polarized light) and XPL (cross polarized light):
— Alexstrekeisen (@alexstrekeisen) May 5, 2020
Cross twinned Staurolite crystal (yellow in PPL) surrounded by quartz (gray birefringence in XPL), muscovite and small green (in PPL) tourmaline crystals. Posada Asinara shear zone, Sardinia (Italy). 10x (FOV = 2mm). pic.twitter.com/C03XRqUdb2
via Twitter https://twitter.com/alexstrekeisen
May 05, 2020 at 12:21PM
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