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21 June 2016
Porphyritic rhyolite dike seen on the beach at Cushendun
At the opposite end of the beach at Cushendun, Northern Ireland, we found some outcrops of schist – I’ll be featuring some of them as Friday folds later this week. But cutting across the schist was a pink porphyry, with big well-formed potassium feldspars. I splashed some water from the Irish Sea onto it to increase the contrast: Here’s a handheld GigaPan image, so you can explore it for yourself. …