ok #Geotweeps we need opinions. (from the mineralogical/metamorphic hive in particular). Myself and @AnnaBirdian are a little stumped about our mystery blue mineral. At first we thought it was sapphire or sapphirine but are unsure. Rock type - granulite facies mafic gneiss pic.twitter.com/NwAB8Wchbz
— tectonictweets (@tectonictweets) March 7, 2019
via Twitter https://twitter.com/tectonictweets
March 07, 2019 at 11:08PM
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