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pitchstone; dark green, porphyritic, with phenocrysts of plagioclase, fayalite, ferroaugite and orthopyroxene

Glen Shurig, half a mile WSW of Brodick Church, Arran, [North Ayrshire], [Scotland] [5ft dyke in O.R.S.], [Palaeogene] Nice fresh rock. Tyrrell list says "Pitchstone dyke in Old Red Sandstone, Glen Shurig, 1/2m WSW of Brodick Church".