How does #garnet becomes black?
— Dr Barbara Kunz (@KunzBE) October 2, 2018
Fine grained graphite inclusions
(Field photograph and the BSE image are not from the same rock, not even the same orogen 😉)#MinCup2018 pic.twitter.com/m4cEsekoEX
via Twitter https://twitter.com/KunzBE
October 03, 2018 at 02:29AM
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