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felsite; pale grey, porphyritic, with large quartz and oligoclase? phenocrysts

Barr Buidhe, (Roinn Clumhach?), south Isle of Bute, [Argyll and Bute], [Scotland] margin of 1' E pitchstone dyke, cutting slaggy basalts, [Palaeogene] Often called "quartz feldspar porphyry". Some confusion about locality: label stuck to specimen gives "Barr Buidhe", while catalogue gives "Roinn Clumhach".