Petro-fact of the day:
— Dr. Sarah Lambart (@Sarah_Lambart) March 27, 2020
(1) The small black "stains" in the crystal of biotite are called pleochroic haloes. #petrology (1/4) pic.twitter.com/NNRv0Yq88f
via Twitter https://twitter.com/Sarah_Lambart
March 27, 2020 at 07:26PM
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