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tachylite; fresh black glassy chilled margin in contact with basalt

Port Uamh na Gaibhre, below Ardtun cliff line, [Bunessan, Isle of Mull, Argyll and Bute], [Scotland] margin of sill, [Palaeogene] Nice chilled margin - would perhaps be improved by sawing and polishing. May be tholeiitic or andesitic in composition?