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pitchstone; spherulitic, with phenocrysts of quartz and feldspar, and yellowish and reddish alteration along fractures

Kings Cave, Arran [North Ayshire], [Scotland] base of sill, [Palaeogene] Tyrrell list says "Ar 542 pitchstone base of sill at top of cliff, S of Pitchstone BLuff, S of Kings Cave, Drumadoon Coll GWT 4/28"