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pitchstone; green, porphyritic, with phenocrysts of plagioclase, quartz, clinopyroxene, zircon and fayalite, and sparse spherulites

ridge between Ben Tarsuinn and Ben Nuis, Arran [North Ayshire], [Scotland] loose, boulder, [Palaeogene] Tyrrell list says "Pitchstone boulder on ridge between Ben Tarsuinn and Ben Nuis"