A lonely little fluorite cube (2 mm diameter) floating in a sea of silica. Nice to be back looking at my samples from the North Pennine Orefield #IWillFinishThisPaperEvenIfItKillsMe pic.twitter.com/P0kftrGphZ
— tectonictweets (@tectonictweets) January 8, 2019
via Twitter https://twitter.com/tectonictweets
January 08, 2019 at 10:57PM
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