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felsite/andesite?; spherultic, pale green, porphyritic with sparse plagioclase phenocrysts

Glen Cloy, [Brodick], Arran [North Ayshire], [Scotland] Scott's sill, [Palaeogene] Nice looking rock, but highly altered. Probably andesitic? Tyrrell list says "Ar 617 Spherulitic felsite, sill, Glen Cloy (Scott's sill)"