Pleochroism is a change in color caused by a mineral absorbing different wavelengths of transmitted light at different orientations. #BIOTITE is a great example of a pleochroic mineral (PPL, fov=5mm), so it gets my vote R1 of #MinCup2019!
— Melissa Scruggs (@VolcanoDoc) September 10, 2019
(Apologies for my shoddy camera work.) pic.twitter.com/qAB2lRpbBq
via Twitter https://twitter.com/VolcanoDoc
September 11, 2019 at 04:36AM
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