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pitchstone; porphyritic, with phenocrysts of quartz, plagioclase, clinopyroxene, fayalite, and magnetite; some spherulitic devitrification

Torr Righ Beag, Tormore, Arran, Scotland Judd No 2 dyke, Fv on S side: 0-0.6m thick, [Palaeogene] MANU HERRIOT, Alex late C20th East Kilbride Scotland Slide number AH:4763 from the collection bequeathed by Alex Herriot of East Kilbride, in 1998.