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#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_IODPpic.twitter.com/Tg6lQOLLZM -
#MinCup18#TeamGypsum. A gypsum vein with#anhydrite in a#smectite#natroalunite#pyrite matrixpic.twitter.com/HiIvIJSrYU -
#ThinSectionThursday native#sulphur (green-pink) within a#quartz#natroalunite vein from the#Brothers#Volcano#NZ. I love the colours of native sulphur in#XPL!@ECORD_IODP@CU_EARTH#IODP#EXP376pic.twitter.com/2rVVnYXyQI
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