#ThinSectionThursday a pseudomorphed #plagioclase #phenocryst from the #Brothers #volcano #NZ. Replaced by #natroalunite #silica and #smectite and surrounded by #clay with #pyrite and #anhydrite #EXP376 #alteration #geology #hydrothermal @ECORD_IODP pic.twitter.com/Tg6lQOLLZM
— Andrew J. Martin (@ajmartin1991) August 23, 2018
via Twitter https://twitter.com/ajmartin1991
August 23, 2018 at 12:23PM
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