my #ThinSectionThursday offering: Some brecciated quartz (fractures infilled with marcasite) if you look carefully you can see ghosts of fluorite crystals that the quartz has replaced. pic.twitter.com/ygTSb3KeOI
— tectonictweets (@tectonictweets) August 23, 2018
via Twitter https://twitter.com/tectonictweets
August 23, 2018 at 03:00PM
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