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pitchstone; porphyritic, with phenocrysts of plagioclase, clinopyroxene, and fayalite, and dendritic crystallites

Brodick, Arran Scotland "Schoolhouse Pitchstone", [Palaeogene] MANU HERRIOT, Alex late C20th East Kilbride Scotland Slide number AH:1077 from the collection bequeathed by Alex Herriot of East Kilbride, in 1998.