Cordierite phenocryst with cyclic twinning, immersed in a vitreous groundmass in a Rhyolite from San Vincenzo, Tuscany (Italy). XPL (with lambda plate) image, 20x (FOV = 1mm)#ThinSectionThursday #cordierite #rhyolite #tuscany #italy pic.twitter.com/QarsCmXiDC
— Alexstrekeisen (@alexstrekeisen) January 7, 2021
via Twitter https://twitter.com/alexstrekeisen
January 07, 2021 at 08:42PM
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