A photomicrograph of slate highlighting qtz, chloritoid, feldspar, organic matter #geology #thestoryofslate http://pic.twitter.com/ltW19WVzgO
— John Van Hoesen (@Taconic_Musings) August 8, 2016
via Twitter https://twitter.com/Taconic_Musings
August 08, 2016 at 06:32PM
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