Pleochroic halo around zircon crystals enclosed in biotite. PPL (plane polarized light). 20x (FOV = 1mm).
— Alexstrekeisen (@alexstrekeisen) July 31, 2020
Pleochroic halos are microscopic, spherical shells of radiation damage caused by the inclusion of minute radioactive crystals within the host crystal structure. pic.twitter.com/FTxy65Fdiq
via Twitter https://twitter.com/alexstrekeisen
July 31, 2020 at 04:05PM
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