#ThinSectionThursday or should that be #ThickSectionThursday? C19th thin section of anorthosite from "Haskival, Rum", #Heddle collection in #Hunterian. Plagioclase showing gaudy birefringence colours due to section being twice as thick as the modern standard 30 microns.. pic.twitter.com/5J0I1NSKOB
— John Faithfull (@FaithfullJohn) October 18, 2018
via Twitter https://twitter.com/FaithfullJohn
October 18, 2018 at 08:51PM
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