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pitchstone; porphyritic, with phenocrysts of quartz, plagioclase, clinopyroxene and fayalite

Brodick, [Arran, North Ayrshire], Scotland ["Schoolhouse Pitchstone"], [Palaeogene] MANU HERRIOT, Alex late C20th East Kilbride Scotland Slide number AH:988 from the collection bequeathed by Alex Herriot of East Kilbride, in 1998.