Photomicrograph of granophyric granite from the Mourne Mountains Tunnel, Co. Down for #ThinSectionThursday http://pic.twitter.com/FxOe6mrOqZ
— Geological Survey NI (@GeoSurveyNI) July 20, 2017
via Twitter https://twitter.com/GeoSurveyNI
July 20, 2017 at 03:30PM
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