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pitchstone; dark brown; porphyritic, with phenocrysts of plagioclase, clinopyroxene and otrthopyroxene?, in an almost opaque brown groundmass

Glen Cloy, [Brodick], Arran [North Ayshire], [Scotland] contact, Scott's sill, [Palaeogene] Unusual rock. Tyrrell list says "Ar 619 pitchstone contact, sill, Glen Cloy (Scott's sill)"