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andesite; porphyritic, with phenocrysts of plagioclase and orthopyroxene, in altered glassy groundmass ("cumbraite")

West Kilbride, Strathclyde Scotland dyke:i: MANU HERRIOT, Alex late C20th East Kilbride Scotland Slide number AH:280 from the collection bequeathed by Alex Herriot of East Kilbride, in 1998.