PPL and XPL: Dioptase (CuSiO3 · H2O) with fantastic azure-green colors at PPL, and high interference colors at XPL in a quartz vein in a limstone. Congo, 2x (FOV 7mm). #alexstrekeisen #thinsection #dioptase #congo pic.twitter.com/B0yd2ZshqU
— Alexstrekeisen (@alexstrekeisen) May 15, 2021
via Twitter https://twitter.com/alexstrekeisen
May 15, 2021 at 10:40PM
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