This is the third instalment of my Iceland trip report. Have a read of the first and second if you haven't already. Columnar basalt, the rock found in Fingal's Cave, the south end of the Isle of Bute and the Giant's Causeway among other places,  is a common rock in Iceland. It is at its most impressive when seen side on, an array of perfectly, uncannily, parallel columns, as if they have been chiselled into a rock face by master stonemasons. The hexagonal columns form as the rock solidifies from More

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