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pitchstone; dark green, aphyric, with small pale spherulites, and small crystal-lined elongate cavities

Dun Fionn, [South Corriegills], Arran [North Ayshire], [Scotland] small sill beneath Clauchlands crinanite sheet, [Palaeogene] Norman Holgate specimen list says: ""Pitchstone, (Corrygills Type) small sill beneath Clauchlands crianite sheet, above path between Dunfinn Cott. and Dun Fionn, S. Corrygills, Brodick I. of Arran (042340)".