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

Arran Scotland dyke or sill:i: MANU HERRIOT, Alex late C20th East Kilbride Scotland Slide number AH:226 from the collection bequeathed by Alex Herriot of East Kilbride, in 1998.