Come on, guys. It must be #BIOTITE!
— micROCKScopica (@micROCKScopica) September 10, 2019
One of the most important minerals in the crust (plus mantle phologopite)
IT MAKES BEAUTIFUL FOLIATIONS@MineralCup #MinCup #MinCup2019 #geology #petrography #rocks #photography #microscopy pic.twitter.com/MZOVhyORCc
via Twitter https://twitter.com/micROCKScopica
September 10, 2019 at 05:09PM
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