Porphyroblasts of corundum (ruby varieties) in association with sillimanite (fibrous) biotite and feldspar. High-grade Gneiss from India. PPL (Plane polarised light) and XPL (cross polarised light) image, 10x (Field of view 2 mm). pic.twitter.com/rglULJEStP
— Alexstrekeisen (@alexstrekeisen) February 24, 2021
via Twitter https://twitter.com/alexstrekeisen
February 24, 2021 at 11:37AM
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